Fix how bundle IDs are getting defined for individual bundles

[alwx]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Fixes #5250

Here is the root cause:

• Lazy-loaded chunks are serialized separately with their own preModules array
• The debug ID module is only added to the main bundle's preModules
• When processing a lazy chunk, determineDebugIdFromBundleSource() can't find the debug ID → returns null
• The code throws an error instead of handling this gracefully

The solution is to generate bundle IDs for individual code chunks.
That needs to be done because when Metro 0.83.2 stopped importing BabelSourceMapSegment from @babel/generator and defined it locally, it subtly changed the source map output format.

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Warnings
⚠️	🤖 Replay Stubs Check ✅ No changes detected in replay-stubs.jar All file contents are identical (verified by SHA-256 hash comparison).

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Fixes

- Fix how bundle IDs are getting defined for individual bundles ([#5341](https://github.com/getsentry/sentry-react-native/pull/5341))

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