✅ [PANA-6831] Support the Change data format in E2E tests

[sethfowler-datadog]

Motivation

As we transition away from the old V1 session replay data format and to the new Change format, we need to update all tests to support both formats. (Eventually, we'll remove the V1 tests, but we're not quite there yet.) The E2E tests currently don't support the Change data format, so we need to update them.

Changes

This PR updates all recording E2E tests that involve DOM mutations to support both the V1 and Change data formats.

I used one of two strategies.

For tests which involve nothing but full or incremental DOM mutations, I split the test into two totally separate implementations, one for the V1 format and one for the Change format. I switched to a snapshot testing model for the Change format implementation; my experience is that for these kinds of data format tests, this approach is the most effective at catching bugs and makes maintenance easy.

Some tests involve a mix of DOM mutations and other kinds of incremental mutations. Because only DOM mutations have been converted to use the new Change format, these tests mix together records with very different formats. This makes snapshot testing a bit awkward for now; it's easier to write specific assertions. For these tests, I used a unified implementation for both the V1 and Change formats, and relied on helpers that have different code paths internally to support both cases.

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

[datadog-prod-us1-4]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 77.12% (-0.49%)

_{This comment will be updated automatically if new data arrives.
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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	177.94 KiB	177.94 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.03 KiB	27.03 KiB	0 B	0.00%	✅
Logs	56.40 KiB	56.40 KiB	0 B	0.00%	✅
Rum Slim	133.81 KiB	133.81 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	0.0045	0.0051	+13.33%
RUM - add action	0.0143	0.0173	+20.98%
RUM - add error	0.0134	0.0206	+53.73%
RUM - add timing	0.0032	0.0031	-3.13%
RUM - start view	0.0142	0.0132	-7.04%
RUM - start/stop session replay recording	0.0007	0.0008	+14.29%
Logs - log message	0.0142	0.0163	+14.79%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.50 KiB	26.64 KiB	-879 B
RUM - add action	96.72 KiB	97.31 KiB	+602 B
RUM - add timing	26.30 KiB	26.34 KiB	+48 B
RUM - add error	97.86 KiB	82.32 KiB	-15.55 KiB
RUM - start/stop session replay recording	26.29 KiB	26.23 KiB	-67 B
startview	N/A	476.73 KiB	N/A
Logs - log message	102.30 KiB	97.34 KiB	-4.96 KiB

🔗 RealWorld