test: add replay identity conformance case

[zhongkechen]

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Issue Link, if available

Implements aws/aws-durable-execution-conformance-tests#111.

Description

Adds the general conformance suite and Java handler for requirement 11-1.
The handler emits a named WAIT initially, then deliberately emits a named
STEP at the same durable position on replay. Replay logging is enabled so the
suite can assert that replay occurred and that the mismatched step body never
ran.

Demo/Screenshots

Not applicable.

Checklist

• I have filled out every section of the PR template
• I have thoroughly tested this change

Testing

Unit Tests

• mvn -pl conformance-tests -am test (1,157 tests passed)
• mvn spotless:apply

Integration Tests

The new general suite is discovered by the existing conformance workflow and
will run requirement 11-1 against the deployed handler.

Examples

Added general.ReplayOperationIdentity as the conformance handler for 11-1.

[github-actions]

Codex AI review

No actionable findings. Residual risk: the cloud-only conformance scenario and log assertions were reviewed statically but not executed under the review constraints.

Reviewed commit 9a133981d11493ae944c68f855982adb6d743428. Workflow run