⚗️ [RUM-13259] Add shadow DOM support for action selectors

[rgaignault]

Motivation

Second part of shadow DOM support for actions. This PR adds selector generation for elements inside shadow DOM, using a /shadow/ marker to indicate shadow boundaries.
Follows up on the first PR that added action name support.

Changes

• Generate selectors that cross shadow DOM boundaries with /shadow/ marker
• Added unit tests for shadow DOM selectors
• Added e2e tests for selector generation

These two pictures are coming from the same click with and without the parameter enabled. The selector is correct and more precise that's why the width and height are smaller.

Before

After

Selector query

Test instructions

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[chatgpt-codex-connector]

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[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	164.92 KiB	165.17 KiB	+252 B	+0.15%	✅
Rum Profiler	4.33 KiB	4.33 KiB	0 B	0.00%	✅
Rum Recorder	24.48 KiB	24.48 KiB	0 B	0.00%	✅
Logs	56.14 KiB	56.14 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	122.15 KiB	122.40 KiB	+252 B	+0.20%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.004	0.005	+25.00%
RUM - add action	0.012	0.0138	+15.00%
RUM - add error	0.0114	0.0161	+41.23%
RUM - add timing	0.0026	0.0039	+50.00%
RUM - start view	0.0032	0.0052	+62.50%
RUM - start/stop session replay recording	0.0007	0.0011	+57.14%
Logs - log message	0.0133	0.0208	+56.39%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.38 KiB	25.60 KiB	-1.78 KiB
RUM - add action	52.43 KiB	50.04 KiB	-2.39 KiB
RUM - add timing	26.06 KiB	25.53 KiB	-546 B
RUM - add error	57.57 KiB	51.82 KiB	-5.75 KiB
RUM - start/stop session replay recording	26.09 KiB	25.53 KiB	-583 B
RUM - start view	427.23 KiB	423.98 KiB	-3.25 KiB
Logs - log message	99.40 KiB	43.61 KiB	-55.79 KiB

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 84.38%
• Overall Coverage: 77.29% (+0.03%)

View detailed report

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[BeltranBulbarellaDD]

Nice! Works perfectly with the html test
Looks good in the explorer UI too