✅ Add E2E tests for embedded config scenarios

[mormubis]

Motivation

Validate that the full embedded config pipeline works end-to-end: generate a bundle with @datadog/browser-sdk-endpoint, serve it via the test server, and verify the SDK initializes correctly with the embedded configuration.

Changes

New E2E scenarios (15 tests total)

embeddedConfig.scenario.ts (8 tests):

• SDK loads with embedded config (rum and rum-slim variants)
• No remote config network requests during page load (config is pre-embedded)
• Bundle metadata verified (applicationId, configId)

embeddedConfigDynamic.scenario.ts (7 tests):

• Dynamic value markers ($cookie:name, $dom:selector, $js:path) preserved in bundle
• Mixed static/dynamic values work correctly
• Nested dynamic values in configuration objects

Framework additions

• createTest.ts, pageSetups.ts, mock.ts — support for serving pre-generated bundles in E2E tests

Disabled

• remoteConfiguration.scenario.ts → .disabled (superseded by new package approach)

Testing

yarn test:e2e -g "embedded configuration"
yarn typecheck

---

Part of SSI Phase 6 stacked PRs. Stacks on: ✨ @datadog/browser-sdk-endpoint (#4241). Next: rum-core removal (breaking).

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	172.22 KiB	172.22 KiB	0 B	0.00%	✅
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	56.30 KiB	56.30 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	128.00 KiB	128.00 KiB	0 B	0.00%	✅
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	0.0047	0.0045	-4.26%
RUM - add action	0.0147	0.0134	-8.84%
RUM - add error	0.015	0.0148	-1.33%
RUM - add timing	0.0028	0.0025	-10.71%
RUM - start view	0.0135	0.0138	+2.22%
RUM - start/stop session replay recording	0.0007	0.0006	-14.29%
Logs - log message	0.0237	0.0155	-34.60%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	26.79 KiB	27.09 KiB	+301 B
RUM - add action	108.59 KiB	108.77 KiB	+178 B
RUM - add timing	25.98 KiB	26.22 KiB	+242 B
RUM - add error	117.13 KiB	118.93 KiB	+1.80 KiB
RUM - start/stop session replay recording	26.30 KiB	25.55 KiB	-764 B
RUM - start view	506.68 KiB	511.27 KiB	+4.60 KiB
Logs - log message	45.10 KiB	44.38 KiB	-737 B

🔗 RealWorld

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.16% (-0.01%)

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