ci: remove cross-platform-tests and semantic PR/branch checks

[jamesnrokt]

Summary

Removes three checks that have been failing on nearly every recent PR (#690–#711):

• cross-platform-tests — entire workflow deleted (known broken; depends on the external mParticle/crossplatform-sdk-tests repo)
• Check PR for semantic title — pr-title-check job removed from pull-request.yml
• Check PR for semantic branch name — pr-branch-check-name job removed from pull-request.yml

Notes

• If any of these were listed as required checks in branch protection for main, those rules will need to be updated in repo settings so new PRs don't get stuck waiting on checks that no longer run.
• Two other repeat-offender failures were found but not removed here:
  • Notify GChat / notify-gchat — fails on fork PRs / missing secret; it's a notification, not a gate. Worth a follow-up to add continue-on-error or remove.
  • SonarCloud Code Analysis — posted by the SonarCloud GitHub App, not a workflow file. Needs to be turned off in the SonarCloud UI / repo app settings.

Test plan

• CI on this PR shows the three removed checks no longer appear
• Remaining checks (unit tests, lint, instrumented tests, kit compatibility, security, trunk) still run

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Fewer automated quality gates (external cross-platform tests and semantic PR/branch enforcement); branch protection must be updated or PRs can block on missing checks.

Overview
This PR stops running three CI gates that were failing on most recent PRs.

The entire .github/workflows/cross-platform-tests.yml workflow is removed, so PRs no longer check out mParticle/crossplatform-sdk-tests, run Android emulator jobs, or upload cross-platform test reports.

In .github/workflows/pull-request.yml, the reusable jobs pr-branch-check-name (semantic branch name) and pr-title-check (semantic PR title) are dropped. Other jobs in that workflow—Trunk, hardcoded secrets, instrumented/unit/lint tests, kit compatibility, dependabot automerge, GChat notify—are unchanged.

Branch protection may still list the removed check names as required; those rules need to be updated in repo settings or merges can stall waiting for checks that no longer exist.

^{Reviewed by Cursor Bugbot for commit 1c00575. Bugbot is set up for automated code reviews on this repo. Configure here.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[BrandonStalnaker]

Totally agree with removing the cross-platform-tests but do we no longer want standardized branch names and commit messages?