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/testing/java/google/registry/testing/FakeClock.java

@@ -89,6 +89,11 @@ public final class FakeClock implements Clock {
     currentTimeMillis.addAndGet(duration.getMillis());
   }
 
+  /** Advances clock by some duration. */
+  public void advanceBy(java.time.Duration duration) {
+    currentTimeMillis.addAndGet(duration.toMillis());
+  }
+
   /** Sets the time to the specified instant. */
   public void setTo(ReadableInstant time) {
     currentTimeMillis.set(time.getMillis());