ci: Disable PerfPowerServices process on macos-15-intel

[matthewfeickert]

Description

• Disable the PerfPowerServices process on macos-15-intel runners to address known macOS 15 bug that significantly slows down the runner.
  • c.f. macos-15-intel slow, always 100% CPU? actions/runner-images#13358
  • Pattern copied from ci: disable PerfPowerServices process on macos spack/spack#51647

Thanks to @ariostas for alerting us to this!

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Disable the PerfPowerServices process on macos-15-intel runners to
  address known macOS 15 bug that significantly slows down the runner.
   - c.f. https://github.com/actions/runner-images/issues/13358

[matthewfeickert]

• Time for macos-15-intel runner to finish in cad5592: 14 minutes.
• Time for macos-15-intel runner to finish in this PR: 12 minutes.

So faster for sure, but still slow, and more reason to work on parallelizing tests in Issue #1678.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.23%. Comparing base (cad5592) to head (7f27c05).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2641   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files          65       65           
  Lines        4190     4190           
  Branches      453      453           
=======================================
  Hits         4116     4116           
  Misses         45       45           
  Partials       29       29           

Flag	Coverage Δ
contrib	98.11% <ø> (ø)
doctest	98.23% <ø> (ø)
unittests-3.10	96.42% <ø> (ø)
unittests-3.11	96.42% <ø> (ø)
unittests-3.12	96.42% <ø> (ø)
unittests-3.13	96.42% <ø> (ø)
unittests-3.9	96.46% <ø> (ø)

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[Copilot]

Pull request overview

This PR adds a workaround for a known macOS 15 performance bug that significantly slows down Intel-based runners by disabling the PerfPowerServices process. The fix is applied consistently across all GitHub Actions workflows that utilize the macos-15-intel runner.

• Adds a pre-checkout step to disable PerfPowerServices on macos-15-intel runners
• Applies the workaround consistently across all affected workflow files
• Includes proper documentation referencing the upstream GitHub issue

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/ci.yml	Adds PerfPowerServices workaround step before checkout for the main CI/CD workflow
.github/workflows/dependencies-head.yml	Adds PerfPowerServices workaround step before checkout for dependency testing workflow
.github/workflows/release_tests.yml	Adds PerfPowerServices workaround step before checkout for release testing workflow

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