Add a controlled .NET 10 and .NET 11 runtime comparison

[arturcic]

Purpose

Add a bounded, informational Linux runtime comparison for #5210. The same net10 publish runs on exact .NET 10 and .NET 11 runtimes; a net11 publish adds the framework/build comparison. Both Git backends run against reproducible 100- and 5,000-commit packed fixtures, with GitVersion cache bypass and warmed-cache cases.

The harness verifies CoreCLR selection from untimed host traces and requires identical version JSON across every case. It records raw elapsed/CPU/peak-RSS samples, distributions, source/SDK/runtime/CPU metadata and a workflow summary. Child processes use a minimal environment to isolate fixture calculations from CI branch and GitVersion overrides. The workflow runs manually or when a PR changes the harness; it adds no timing gate or benchmark dependency.

Validation

• Published net10 and net11 from the same source using SDK 11.0.100-rc.2.26504.105 in an isolated Linux arm64 container.
• Runtime 10.0.13 and 11.0.0-rc.2.26504.105: 48 samples passed for small smoke fixtures, another 48 with conflicting inherited CI/branch/backend variables, and 48 with the default 100/5,000-commit sizes (two repetitions for validation).
• All runs verified runtime selection and full version-output parity. Confirmed the warmed fixture loads its disk cache.
• Checked invalid repetition counts and refusal to reuse an existing output directory.
• Node syntax, actionlint and diff whitespace checks passed.
• CodeRabbit: fixed inherited CI environment leakage and preservation of mismatching JSON artifacts. The final incremental review reported no findings. Dismissed its unsupported-net11-SDK finding because the pinned RC2 SDK successfully published both frameworks during validation.

These local runs validate the harness only. Hosted Linux amd64 measurements use 15 repetitions per case; no performance improvement is claimed. Direct process startup is included; SDK tool dispatch, allocations/GC, cold OS caches, other platforms and complex histories remain outside this first experiment. RC2 results need repetition at GA before drawing final conclusions.

Related: #5210. Independent of #5383 and arturcic#1027; based on main.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
D Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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