Fix AOT generated GreaterThanEqual derived query

[adityaanikam]

Closes #2365

JdbcCodeBlocks emitted Criteria.greaterThanEquals(...) for the GTE comparator, a method that does not exist on Criteria. The correct method is greaterThanOrEquals(...), used directly above it for the LTE comparator.

Since AOT processing generates a repository's whole fragment as a single Java class, this one bad call broke compilation of the entire generated class, not just the affected query method. I confirmed this by temporarily reverting the fix locally: all 38 tests in JdbcRepositoryContributorIntegrationTests failed, not only a test targeting GreaterThanEqual specifically.

Added findAllByAgeGreaterThanEqual to the UserRepository test fixture and a matching integration test that exercises the generated fragment against a real H2 database, run with mvn test.

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