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.

common/src/main/java/google/registry/util/SystemClock.java

@@ -14,11 +14,11 @@
 
 package google.registry.util;
 
+import static java.time.temporal.ChronoUnit.MILLIS;
 import static org.joda.time.DateTimeZone.UTC;
 
 import jakarta.inject.Inject;
 import java.time.Instant;
-import java.time.temporal.ChronoUnit;
 import javax.annotation.concurrent.ThreadSafe;
 import org.joda.time.DateTime;
 
@@ -43,6 +43,6 @@ public class SystemClock implements Clock {
     // (which uses millisecond precision via DateTimeConverter). This prevents subtle comparison
     // bugs where a high-precision Instant would be considered "after" a truncated database
     // timestamp.
-    return Instant.now().truncatedTo(ChronoUnit.MILLIS);
+    return Instant.now().truncatedTo(MILLIS);
   }
 }