fix(ci): drop internal group from TestFlight upload_to_testflight

[testableapple]

Summary by CodeRabbit

• Bug Fixes
  • Updated TestFlight distribution so external uploads explicitly target the External Testers group.
  • Adjusted internal TestFlight distribution to proceed without assigning a specific tester group.
  • Kept existing settings for upload behavior, notifications, changelog, and build processing as before.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 60ef23a7-4cf0-4222-b7ef-c02691737239

📥 Commits

Reviewing files that changed from the base of the PR and between 4ad3b41 and 4a10566.

📒 Files selected for processing (1)

• sample_app/ios/fastlane/Fastfile

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📝 Walkthrough

Walkthrough

The iOS TestFlight lanes update tester-group handling: external distributions explicitly target External Testers, while internal distributions no longer pass a group.

Changes

TestFlight distribution

Layer / File(s)	Summary
Update TestFlight upload groups sample_app/ios/fastlane/Fastfile	The external lane explicitly passes ['External Testers']; the internal lane removes ['Internal Testers'] while retaining its other upload parameters.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: xsahil03x

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main TestFlight change and is specific enough, though it only mentions the internal group removal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/resolve-tf-issue

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