Update Graal reachability metadata to fix Nexus in time skipping test server

[Quinn-With-Two-Ns]

Update Graal reachability metadata to fix Nexus in time skipping test server. I also had to upgrade the format of the Graal configs to the new reachability-metadata.json. I tested by building the time skipping server as a native executable and running against Python CI.

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Note

Modernizes native build config and verifies Nexus failure handling.

• Migrate GraalVM native-image setup to new reachability-metadata.json and trim native-image.properties; enable agent metadata mergeWithExisting in Gradle
• Add testNexusOperationHandlerTemporalFailure in NexusWorkflowTest using DefaultDataConverter and NexusUtil to validate retryable→non-retryable Nexus handler failures and resulting workflow history

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove test-only types from native image metadata

The new reachability metadata now lists io.temporal.testserver.functional.* test classes for reflection (e.g., ChildLivesLongerThanParentTest). These types live under temporal-test-server/src/test/java and are not present on the runtime classpath when building the temporal-test-server native image, so native-image will fail with a missing class error unless -H:+AllowIncompleteClasspath is enabled. The previous config files did not include test classes, so this regression breaks native builds in the default configuration.

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