Complete Joda-Time to java.time migration (#3039)

This completes the exhaustive refactoring of foundational temporal types from Joda-Time to the native java.time API across the entire codebase.

- Replaced org.joda.time.DateTime, Instant, LocalDate, and Duration with java.time equivalents.
- Audited and updated Clock implementations (FakeClock, SystemClock). Added nowMillis(), nowDate(), and nowDateTime() to eliminate repetitive conversions and maintain parallel naming.
- Replaced ZonedDateTime with OffsetDateTime globally per go/avoid-zdt. OffsetDateTime is a better fit as we use a hardcoded ZoneOffset.UTC throughout the system, making geographical time zone rules (like daylight saving time) irrelevant and preventing serialization ambiguities. Added a presubmit check.
- Completely removed all transitional bridge methods from DateTimeUtils and deleted obsolete converters (e.g., DateTimeConverter).
- Updated testing infrastructure, Apache Beam pipelines, custom JCommander parameters, and networking modules to solely rely on java.time primitives.
- Retained the lone necessary org.joda.time.Instant usage in SafeBrowsingTransforms required by the Apache Beam API.
- Cleared Gradle lockfiles and removed the joda-time dependency entirely from the build configuration.

core/src/test/resources/google/registry/beam/rde/reducer_brda.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <rde:deposit xmlns:contact="urn:ietf:params:xml:ns:contact-1.0" xmlns:rdeContact="urn:ietf:params:xml:ns:rdeContact-1.0" xmlns:launch="urn:ietf:params:xml:ns:launch-1.0" xmlns:rdeEppParams="urn:ietf:params:xml:ns:rdeEppParams-1.0" xmlns:rdeNotification="urn:ietf:params:xml:ns:rdeNotification-1.0" xmlns:host="urn:ietf:params:xml:ns:host-1.0" xmlns:rdeIDN="urn:ietf:params:xml:ns:rdeIDN-1.0" xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0" xmlns:smd="urn:ietf:params:xml:ns:signedMark-1.0" xmlns:rdeHost="urn:ietf:params:xml:ns:rdeHost-1.0" xmlns:rdeReport="urn:ietf:params:xml:ns:rdeReport-1.0" xmlns:fee11="urn:ietf:params:xml:ns:fee-0.11" xmlns:fee12="urn:ietf:params:xml:ns:fee-0.12" xmlns:iirdea="urn:ietf:params:xml:ns:iirdea-1.0" xmlns:rdeHeader="urn:ietf:params:xml:ns:rdeHeader-1.0" xmlns:domain="urn:ietf:params:xml:ns:domain-1.0" xmlns:rdeDomain="urn:ietf:params:xml:ns:rdeDomain-1.0" xmlns:epp="urn:ietf:params:xml:ns:epp-1.0" xmlns:rdeNNDN="urn:ietf:params:xml:ns:rdeNNDN-1.0" xmlns:rdeRegistrar="urn:ietf:params:xml:ns:rdeRegistrar-1.0" xmlns:rgp="urn:ietf:params:xml:ns:rgp-1.0" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:rde="urn:ietf:params:xml:ns:rde-1.0" xmlns:secDNS="urn:ietf:params:xml:ns:secDNS-1.1" xmlns:mark="urn:ietf:params:xml:ns:mark-1.0" xmlns:rdePolicy="urn:ietf:params:xml:ns:rdePolicy-1.0" xmlns:fee_1_00="urn:ietf:params:xml:ns:epp:fee-1.0" xmlns:fee06="urn:ietf:params:xml:ns:fee-0.6" type="FULL" id="AAAABXDKZ6WAA"%RESEND%>
-    <rde:watermark>2000-01-01T00:00:00Z</rde:watermark>
+    <rde:watermark>2000-01-01T00:00:00.000Z</rde:watermark>
     <rde:rdeMenu>
         <rde:version>1.0</rde:version>
         <rde:objURI>urn:ietf:params:xml:ns:rdeDomain-1.0</rde:objURI>

core/src/test/resources/google/registry/beam/rde/reducer_rde.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <rde:deposit xmlns:contact="urn:ietf:params:xml:ns:contact-1.0" xmlns:rdeContact="urn:ietf:params:xml:ns:rdeContact-1.0" xmlns:launch="urn:ietf:params:xml:ns:launch-1.0" xmlns:rdeEppParams="urn:ietf:params:xml:ns:rdeEppParams-1.0" xmlns:rdeNotification="urn:ietf:params:xml:ns:rdeNotification-1.0" xmlns:host="urn:ietf:params:xml:ns:host-1.0" xmlns:rdeIDN="urn:ietf:params:xml:ns:rdeIDN-1.0" xmlns:eppcom="urn:ietf:params:xml:ns:eppcom-1.0" xmlns:smd="urn:ietf:params:xml:ns:signedMark-1.0" xmlns:rdeHost="urn:ietf:params:xml:ns:rdeHost-1.0" xmlns:rdeReport="urn:ietf:params:xml:ns:rdeReport-1.0" xmlns:fee11="urn:ietf:params:xml:ns:fee-0.11" xmlns:fee12="urn:ietf:params:xml:ns:fee-0.12" xmlns:iirdea="urn:ietf:params:xml:ns:iirdea-1.0" xmlns:rdeHeader="urn:ietf:params:xml:ns:rdeHeader-1.0" xmlns:domain="urn:ietf:params:xml:ns:domain-1.0" xmlns:rdeDomain="urn:ietf:params:xml:ns:rdeDomain-1.0" xmlns:epp="urn:ietf:params:xml:ns:epp-1.0" xmlns:rdeNNDN="urn:ietf:params:xml:ns:rdeNNDN-1.0" xmlns:rdeRegistrar="urn:ietf:params:xml:ns:rdeRegistrar-1.0" xmlns:rgp="urn:ietf:params:xml:ns:rgp-1.0" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:rde="urn:ietf:params:xml:ns:rde-1.0" xmlns:secDNS="urn:ietf:params:xml:ns:secDNS-1.1" xmlns:mark="urn:ietf:params:xml:ns:mark-1.0" xmlns:rdePolicy="urn:ietf:params:xml:ns:rdePolicy-1.0" xmlns:fee_1_00="urn:ietf:params:xml:ns:epp:fee-1.0" xmlns:fee06="urn:ietf:params:xml:ns:fee-0.6" type="FULL" id="AAAABXDKZ6WAA"%RESEND%>
-    <rde:watermark>2000-01-01T00:00:00Z</rde:watermark>
+    <rde:watermark>2000-01-01T00:00:00.000Z</rde:watermark>
     <rde:rdeMenu>
         <rde:version>1.0</rde:version>
         <rde:objURI>urn:ietf:params:xml:ns:rdeDomain-1.0</rde:objURI>

core/src/test/resources/google/registry/beam/rde/reducer_rde_report.xml

@@ -5,9 +5,9 @@
     <rdeReport:rydeSpecEscrow>draft-arias-noguchi-registry-data-escrow-06</rdeReport:rydeSpecEscrow>
     <rdeReport:rydeSpecMapping>draft-arias-noguchi-dnrd-objects-mapping-05</rdeReport:rydeSpecMapping>
     <rdeReport:resend>%RESEND%</rdeReport:resend>
-    <rdeReport:crDate>2000-01-01T00:00:00Z</rdeReport:crDate>
+    <rdeReport:crDate>2000-01-01T00:00:00.000Z</rdeReport:crDate>
     <rdeReport:kind>FULL</rdeReport:kind>
-    <rdeReport:watermark>2000-01-01T00:00:00Z</rdeReport:watermark>
+    <rdeReport:watermark>2000-01-01T00:00:00.000Z</rdeReport:watermark>
     <rdeHeader:header>
         <rdeHeader:tld>soy</rdeHeader:tld>
         <rdeHeader:count uri="urn:ietf:params:xml:ns:rdeDomain-1.0">1</rdeHeader:count>

core/src/test/resources/google/registry/flows/poll/poll_message_domain_pending_action_immediate_delete.xml

@@ -23,4 +23,3 @@
     </trID>
   </response>
 </epp>
-

core/src/test/resources/google/registry/rde/deposit_full_out_of_order.xml

@@ -77,8 +77,6 @@
       <rdeDom:exDate>2015-04-03T22:00:00.0Z</rdeDom:exDate>
     </rdeDom:domain>
 
-
-
     <!-- Host: ns1.example.com -->
     <rdeHost:host>
       <rdeHost:name>ns1.example.com</rdeHost:name>