🔥 Remove start stop action and resource experiment flag

[BeltranBulbarellaDD]

Motivation

Removed start/stop action and resource experiment flag.
Also adds addTelemetryUsage( for both features.

Changes

Removes experiment flags and usages from the codebase.
Adds addTelemetryUsage on the usage of s/s actions and resources.

Test instructions

CI should pass.

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

[BenoitZugmeyer]

Could you adjust the tsdoc?

browser-sdk/packages/rum-core/src/boot/rumPublicApi.ts

Line 179 in 9b6698b

* [Experimental] Start an action, stored in `@action`

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	173.76 KiB	173.61 KiB	-161 B	-0.09%	✅
Rum Profiler	8.07 KiB	8.07 KiB	0 B	0.00%	✅
Rum Recorder	21.23 KiB	21.23 KiB	0 B	0.00%	✅
Logs	57.05 KiB	56.96 KiB	-84 B	-0.14%	✅
Rum Slim	131.44 KiB	131.28 KiB	-162 B	-0.12%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🔗 RealWorld

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 76.85% (+0.03%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 82c3c6a | Docs | Datadog PR Page | Give us feedback!}