[RUM-14142] Add source code context to vitals and manual view

[amortemousque]

Motivation

Extend the source code context feature to support manual views and duration vitals. This PR adds support for manually triggered views (startView()) and duration vitals (startDurationVital()/addDurationVital()).

Changes

1. Add handlingStack to vital and view domain context
2. Capture handling stack in startView() and `startDurationVital()``
3. Add e2e test in microfrontend.scenario.ts

Test instructions

yarn test:e2e -g "manual views should have service and version from source code context|duration vitals should have service and version from source code context"

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

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 557014b2a1

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	167.98 KiB	168.26 KiB	+288 B	+0.17%	✅
Rum Profiler	4.32 KiB	4.32 KiB	0 B	0.00%	✅
Rum Recorder	24.54 KiB	24.54 KiB	0 B	0.00%	✅
Logs	56.25 KiB	56.25 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	124.88 KiB	125.14 KiB	+268 B	+0.21%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: cdc1bdc | Docs | Datadog PR Page | Was this helpful? Give us feedback!}