👷 add CI check enforcing gitmoji PR title convention

[thomas-lebeau]

Motivation

PR titles become commit messages on main (squash merge) and feed the changelog generator, which requires a gitmoji prefix. Today nothing prevents a PR from landing with a non-conforming title, which then needs a manual fix-up.

Changes

• Add a Lint PR title GitHub Actions workflow that runs on PR open/edit/reopen and rejects titles missing an allowed gitmoji prefix.
• Extract the canonical gitmoji list into scripts/lib/gitmoji.ts (single source of truth) and refactor the changelog generator to consume it instead of its own local copy.
• Add scripts/check-pr-title.ts + spec, invoked from the workflow via PR_TITLE env var (passed through env, not inline, to avoid shell injection).

Test instructions

• Run yarn test:script and check scripts/check-pr-title.spec.ts passes.
• Locally: PR_TITLE='✨ something' node scripts/check-pr-title.ts exits 0; PR_TITLE='no prefix' node scripts/check-pr-title.ts exits 1 with the allowed-prefix list.
• Once merged, opening a PR with a non-gitmoji title should fail the Lint PR title check.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	169.51 KiB	169.51 KiB	0 B	0.00%	✅
Rum Profiler	5.97 KiB	5.97 KiB	0 B	0.00%	✅
Rum Recorder	21.23 KiB	21.23 KiB	0 B	0.00%	✅
Logs	54.70 KiB	54.70 KiB	0 B	0.00%	✅
Rum Slim	127.85 KiB	127.85 KiB	0 B	0.00%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0021	0.0021	0.00%
RUM - add action	0.0105	0.01	-4.76%
RUM - add error	0.0097	0.0116	+19.59%
RUM - add timing	0.0004	0.0006	+50.00%
RUM - start view	0.0092	0.0109	+18.48%
RUM - start/stop session replay recording	0.0007	0.0007	0.00%
Logs - log message	0.0139	0.0165	+18.71%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	38.24 KiB	38.60 KiB	+374 B
RUM - add action	64.64 KiB	63.51 KiB	-1.13 KiB
RUM - add timing	36.73 KiB	41.24 KiB	+4.51 KiB
RUM - add error	70.01 KiB	69.60 KiB	-414 B
RUM - start/stop session replay recording	45.58 KiB	45.66 KiB	+84 B
RUM - start view	483.88 KiB	492.16 KiB	+8.29 KiB
Logs - log message	55.00 KiB	54.36 KiB	-648 B

🔗 RealWorld

[datadog-prod-us1-4]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 76.96% (+0.00%)

_{This comment will be updated automatically if new data arrives.
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