🚧 [PANA-6282] Add USE_INCREMENTAL_CHANGE_RECORDS feature flag

[sethfowler-datadog]

Motivation

I'm preparing to push the PR that will add incremental snapshot support for Change records. To make testing easier, it'll be easier to have incremental snapshot support on a separate feature flag.

Changes

This PR adds a second feature flag, USE_INCREMENTAL_CHANGE_RECORDS, to control incremental snapshot support.

When this feature flag is on, we behave as if USE_CHANGE_RECORDS is also on. This is just to ensure that nobody accidentally runs in a weird, untested configuration where the full snapshots use the old format but the incremental snapshots use the new one; while this should work, I don't want to have to test it. 🙂

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-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 75.00%
• Overall Coverage: 76.72% (-0.00%)

_{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	174.37 KiB	174.43 KiB	+66 B	+0.04%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	25.14 KiB	25.24 KiB	+102 B	+0.40%	✅
Logs	56.78 KiB	56.84 KiB	+66 B	+0.11%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	130.05 KiB	130.11 KiB	+66 B	+0.05%	✅
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	0.0041	+2.50%
RUM - add action	0.0123	0.0123	0.00%
RUM - add error	0.0148	0.0119	-19.59%
RUM - add timing	0.0031	0.0026	-16.13%
RUM - start view	0.0123	0.0112	-8.94%
RUM - start/stop session replay recording	0.0008	0.0007	-12.50%
Logs - log message	0.0139	0.0136	-2.16%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	26.77 KiB	26.62 KiB	-154 B
RUM - add action	50.50 KiB	50.50 KiB	-4 B
RUM - add timing	25.75 KiB	26.92 KiB	+1.17 KiB
RUM - add error	55.64 KiB	55.40 KiB	-241 B
RUM - start/stop session replay recording	25.25 KiB	26.31 KiB	+1.06 KiB
RUM - start view	448.46 KiB	451.21 KiB	+2.75 KiB
Logs - log message	43.63 KiB	45.16 KiB	+1.53 KiB

🔗 RealWorld