Enable linux_arm64 coreclr build for SVE perf benchmarks.

[ilonatommy]

The cobaltSveMicro job added in dotnet/performance#5127 targets linux_arm64 on perfcobalt, which generates a dependency on the build_linux_arm64_release_coreclr job. This job was never created because linux_arm64 was not enabled in perf-build-jobs.yml, causing all dotnet-runtime-perf pipeline builds to fail with a YAML validation error since https://dev.azure.com/dnceng/internal/_build/results?buildId=2929255&view=results.

Run with this change: https://dev.azure.com/dnceng/internal/_build/results?buildId=2929520&view=results.

When it finishes, we have to trigger dotnet-performance-infra with Azure Batch task that processes the new data. That should show the results in history index for coreclr.

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[Copilot]

Pull request overview

Enables CoreCLR + libraries performance build jobs to also run for Linux arm64, expanding the perf pipeline’s build matrix to produce arm64 artifacts alongside existing x64 and Windows builds.

Changes:

• Pass linux_arm64: true into the perf-coreclr-build-jobs.yml template from perf-build-jobs.yml.

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[ilonatommy]

The original problem is fixed, there are still infra issues that cause timeouts but do not look related. Merging.