[FIX] [V2] Babel Plugin: handle undefined wrapped callback functions

[cdn34dd]

What does this PR do?

Solves issue #1226 by using optional chaining on the wrapped function invocation.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[Copilot]

Pull request overview

This PR fixes issue #1226 by implementing optional chaining (?.) on handler function invocations in the Babel plugin to safely guard against undefined optional handler props (e.g., onPress on Pressable components).

Changes:

• Applied optional chaining to the fallback branch where handlers are called when the DD SDK is not initialized (using Babel's optionalCallExpression API)
• Applied optional chaining to the DD-initialized branch in DdBabelInteractionTracking.wrapRumAction()
• Updated all test snapshots to reflect the new optional chaining syntax
• Added comprehensive test coverage for undefined/null handler scenarios

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/react-native-babel-plugin/src/actions/rum/tap.ts	Replaced t.callExpression with t.optionalCallExpression for fallback branches to generate optional chaining in both inline and memoized scenarios
packages/core/src/rum/instrumentation/interactionTracking/DdBabelInteractionTracking.ts	Updated the fallback branch to use optional chaining (func?.(...args)) when calling handlers
packages/react-native-babel-plugin/test/plugin.test.ts	Updated all test snapshots to expect optional chaining syntax and added new test suite for undefined handler safety
packages/core/src/rum/instrumentation/interactionTracking/tests/DdBabelInteractionTracking.test.ts	New comprehensive test file verifying undefined/null handlers don't crash

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[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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