chore(Android): fix CI generated changelog

[Rohit3523]

Proposed changes

Play Store enforces a 500 character limit for changelogs, but the existing logic was validating against 500 bytes. This allowed multibyte characters to pass the check, causing uploads to fail at release time.
This PR introduces a Node.js script that correctly counts characters and trims the changelog to a maximum of 500 characters, ensuring Play Store uploads succeed reliably.

Action Link: https://github.com/RocketChat/Rocket.Chat.ReactNative/actions/runs/21064075567

Issue(s)

https://rocketchat.atlassian.net/browse/CORE-1634

How to test or reproduce

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

[coderabbitai]

Walkthrough

This pull request refactors the Android changelog preparation workflow by extracting inline truncation logic from a GitHub Action into a dedicated Node.js script that properly handles Unicode grapheme clusters.

Changes

Cohort / File(s)	Summary
GitHub Actions Configuration /.github/actions/upload-android/action.yml	Replaced 8 lines of inline changelog truncation logic with a call to prepare-changelog.js Node script. Preserves default message behavior when changelog.txt is absent.
Changelog Processing Script /.github/scripts/prepare-changelog.js	New Node.js script that reads changelog.txt, splits content into grapheme clusters, truncates to 500 grapheme units with "..." suffix if needed, and writes output to android/fastlane/metadata/android/en-US/changelogs/${BUILD_VERSION}.txt.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• chore: changelog in beta release #6899 — Introduced the inline changelog truncation logic in the GitHub Action that this PR extracts into a dedicated script for better maintainability and grapheme-aware handling.

Suggested reviewers

• diegolmello

Poem

🐰 A changelog hops through grapheme streams,
Five hundred clusters, bursting at the seams,
With careful dots to mark the end,
Now scripts and actions perfectly blend,
Unicode-safe, our beta builds transcend! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR addresses CORE-1634's requirement to include changelogs with PR titles in beta releases by implementing a Node script to prepare and truncate Android changelog content.
Out of Scope Changes check	✅ Passed	All changes focus on Android changelog preparation through script refactoring and are directly aligned with the linked issue requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore(Android): fix CI generated changelog' directly describes the main change—replacing inline changelog logic with a Node script for proper Android changelog generation.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch android-changelog-fix

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