chore: Up-port from develop-2.0.0 from week 32/33

[michalChrobot]

Purpose of this PR

PR that up-ports PRs that landed during last 2 weeks or otherwise since we did the last up-port.
Note that I won't "squash and merge" and I will rather merge them separately as then in the future it will be easier to reason about PRs history.
Also not all commits are ported because some of them were up-ported already (picture shows the range of commits I was evaluating)

Jira ticket

N/

Documentation

N/A

Testing & QA (How your changes can be verified during release Playtest)

Green CI

Up-port

This is an up-port

Backports

N/A

[cla-assistant-unity]

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[u-pr]

💡 Harness Review

The allocation-focused runtime changes are generally coherent, but the new integration coverage is not excluded from a known failing CoreCLR configuration and two diagnostic/validation changes alter behavior incorrectly.

_{Reviewed commit c30cbc3}

_{🤖 Helpful? 👍/👎}

[codecov-github-com]

Codecov Report

Attention: Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...eobjects/Runtime/Messaging/Messages/RpcMessages.cs	0.00%	2 Missing ⚠️

@@                Coverage Diff                @@
##           develop-3.x.x    #4141      +/-   ##
=================================================
- Coverage          78.02%   78.00%   -0.02%     
=================================================
  Files                153      153              
  Lines              26260    26264       +4     
=================================================
- Hits               20489    20487       -2     
- Misses              5771     5777       +6     

Flag	Coverage Δ
NGOv2_project_testproject_ubuntu_pinnedTrunk	77.62% <93.33%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../Messaging/Messages/NetworkVariableDeltaMessage.cs	77.92% <100.00%> (ø)
...objects/Runtime/Messaging/NetworkMessageManager.cs	82.39% <100.00%> (ø)
...netcode.gameobjects/Runtime/Metrics/MetricHooks.cs	100.00% <100.00%> (ø)
...Runtime/NetworkVariable/Collections/NetworkList.cs	79.75% <100.00%> (-0.07%)	⬇️
...ode.gameobjects/Runtime/Serialization/BitReader.cs	94.23% <100.00%> (ø)
...eobjects/Runtime/Serialization/FastBufferReader.cs	80.03% <100.00%> (ø)
...eobjects/Runtime/Messaging/Messages/RpcMessages.cs	42.61% <0.00%> (+0.94%)	⬆️

... and 1 file with indirect coverage changes

Components	Coverage Δ
com.unity.netcode.gameobjects	78.00% <93.33%> (-0.02%)	⬇️

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