fix: Warn when promise rejections won't be caught

[jennmueng]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

This fix will appear to not work in the original sample app in this repo as our SDK will use the promise library from the root folder instead of the one inside the sample folder that React Native uses. Thus the end to end tests have been updated to use a packaged version of the SDK via yalc. This way the promise rejection handler will be tested.

e2e test workflow will run the script sample/scripts/prepareConfigsForTesting.sh which will swap out the babel config and the metro config to the testing one which will use the packaged SDK instead.

Extra

• Removes Flipper from Android sample
• Also the behavior of the promise rejection handler will follow the behavior of the default react native handler rather than just calling. a console.warn like before.

💡 Motivation and Context

Fixes #1077

💚 How did you test it?

End to end tests will now package the SDK and test the unhandled promise instrumentation.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing
• No breaking changes

🔮 Next steps

Merge docs PR getsentry/sentry-docs#4392

[jennmueng]

For some reason the android emulator for the e2e test isn't working, says app never started. Works locally... going to keep debugging this

[jennmueng]

Accidentally hit close

[marandaneto]

@AbhiPrasad would you mind reviewing this one too? that's a field I don't master, thanks.

[AbhiPrasad]

awesome, sorry for the late review. I'll make sure the ✅ comes back way faster :)))

[AbhiPrasad]

Think its unavoidable now, but lets please split up the CI changes from the implementation so that things are easier to revert/git blame in the future.

[marandaneto]

agreed, but splitting up would break the e2e since the CI changes are needed, let's keep this in mind for the next PR but I'd rather merge it for now since it's an important fix.

[jennmueng]

Thanks @AbhiPrasad! Just got back from thanksgiving break and addressed your review. Next time will make separate PRs for CI changes.

[marandaneto]

thanks for reviewing @AbhiPrasad