[PANA-6072] add composedPathSelector to click actions target behind FF

[LFBarreto]

Motivation

PANA-6072

Changes

This adds a composedPath based selector string that will be used in Product Analytics action management.
For more info

• The new field is added to @_dd.action.target.composed_path_selector, it is built by collecting id, attributes, classes and child position data (nth-child nth-of-type)
• The composed string is truncated to a maximum of 2kb character length
• The attributes collected are limited to a predefined allow list to avoid collecting PII data, this attribute list can be extended via the rum configuration allowedHtmlAttributes
• 🚩The data is only collected for now if the experimentalFeatureFlag composed_path_selector is set in the config

Test instructions

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

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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	172.21 KiB	173.74 KiB	+1.52 KiB	+0.88%	✅
Rum Profiler	4.71 KiB	4.71 KiB	0 B	0.00%	✅
Rum Recorder	24.88 KiB	24.88 KiB	0 B	0.00%	✅
Logs	56.29 KiB	56.34 KiB	+50 B	+0.09%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	127.99 KiB	129.49 KiB	+1.50 KiB	+1.17%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 1 Test failed

action collection with composed path selector › should return a composed_path_selector if flag is enabled › async from rum/actions.scenario.ts (Datadog) (Fix with Cursor)

actions.scenario.ts:803:13 async

[chromium] › rum/actions.scenario.ts:803:13 › action collection with composed path selector › should return a composed_path_selector if flag is enabled › async 

    Error: expect(received).toBe(expected) // Object.is equality

    Expected: "BUTTON#my-button[data-test-allowed=\"test-btn\"].bar.baz.foo:nth-child(2):nth-of-type(2);DIV#container;"
    Received: "BUTTON#my-button[data-test-allowed=\"test-btn\"].bar.baz.foo:nth-child(2):nth-of-type(2);DIV#container:nth-child(1);"

      820 |       const actionEvents = intakeRegistry.rumActionEvents
...

ℹ️ Info

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 76.92%
• Overall Coverage: 77.19% (+0.01%)

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