Refactor bsa, dns, batch, and reporting packages to java.time (#3031)

This commit migrates the BSA, DNS, batch, and reporting packages from Joda-Time
to java.time. Key changes include:

- Updated Sleeper, Clock, and BigqueryUtils to use java.time types natively.
- Refactored models like RdeRevision and Tld to eliminate redundant Joda
  conversions, utilizing new DateTimeUtils static utilities for LocalDate.
- Improved test safety by replacing dynamic Instant.now() calls with static
  parsed constants.
- Migrated temporal arithmetic in test suites to use DateTimeUtils convenience
  methods (plusDays, minusDays).
- Updated BigqueryUtils serialization to preserve millisecond precision and
  formatting for large years, ensuring consistency with previous Joda behavior.
- Enhanced code readability by converting long concatenated strings to Java
  text blocks in LordnLogTest.
- Resolved environmental test failures in SyncRegistrarsSheetTest by
  synchronizing the FakeClock with the JPA extension.
- Updated project engineering standards (GEMINI.md) to prefer Truth's
  .hasValue() for Optional assertions.

Verified with a clean full build and all relevant test suites passing.

proxy/src/main/java/google/registry/proxy/ProxyModule.java

@@ -14,6 +14,7 @@
 
 package google.registry.proxy;
 
+
 import static com.google.common.base.Preconditions.checkArgument;
 import static google.registry.proxy.ProxyConfig.getProxyConfig;
 

proxy/src/test/java/google/registry/proxy/handler/EppQuotaHandlerTest.java

@@ -17,6 +17,7 @@ package google.registry.proxy.handler;
 import static com.google.common.truth.Truth.assertThat;
 import static google.registry.proxy.Protocol.PROTOCOL_KEY;
 import static google.registry.proxy.handler.EppServiceHandler.CLIENT_CERTIFICATE_HASH_KEY;
+import static org.joda.time.DateTimeZone.UTC;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
@@ -36,7 +37,6 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.embedded.EmbeddedChannel;
 import org.joda.time.DateTime;
-import org.joda.time.DateTimeZone;
 import org.joda.time.Duration;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -49,7 +49,7 @@ class EppQuotaHandlerTest {
   private final EppQuotaHandler handler = new EppQuotaHandler(quotaManager, metrics);
   private final EmbeddedChannel channel = new EmbeddedChannel(handler);
   private final String clientCertHash = "blah/123!";
-  private final DateTime now = DateTime.now(DateTimeZone.UTC);
+  private final DateTime now = DateTime.now(UTC);
   private final Object message = new Object();
 
   private void setProtocol(Channel channel) {