feat(expo) better script state for upload

[quinlanj]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

I was looking through the repo issues and noticed someone had problems with uploading their sourcemaps to Sentry #3546. The expo upload script reported everything was fine even though no sourcemaps were uploaded.

This PR:

• Prints a green checkmark when all the sourcemaps and assets are present
• Print warnings when sourcemaps are missing.
• When all sourcemaps are missing, prompts to tell user to add a --dump-sourcemap flag.

💡 Motivation and Context

💚 How did you test it?

test project

Happy case

⬆️ Uploading dist/_expo/static/js/ios/AppEntry-50bca667cd580a120248b3b22f26def6.hbc bundle and sourcemap...
...
✅ Uploaded bundles and sourcemaps to Sentry successfully.

Partially missing sourcemaps

❓ Sourcemap for dist/_expo/static/js/android/AppEntry-3b9811f2869bc9ddc4264abc7f4e2f8c.hbc not found, skipping...
...
⚠️  Uploaded 1 of 2 bundles and sourcemaps. 

Completely missing sourcemaps

❓ Sourcemap for dist/_expo/static/js/ios/AppEntry-50bca667cd580a120248b3b22f26def6.hbc not found, skipping...
...
⚠️  Uploaded 0 of 2 bundles and sourcemaps. Ensure you are running `expo export` with the `--dump-sourcemap` flag.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• All tests passing
• No breaking changes

🔮 Next steps

[krystofwoldrich]

@quinlanj Thank you, this is a good addition that will minimize the number of issues our users can run into.