Move all jobs to ubuntu-slim runner

[jwillemsen]

* .github/workflows/hassfest.yaml:
* .github/workflows/precommit.yaml:
* .github/workflows/tests.yaml:
* .github/workflows/validate.yml:

Summary by CodeRabbit

• Chores
  • Updated CI/CD workflow infrastructure configurations for improved resource efficiency across automated testing and validation pipelines.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

This pull request updates four GitHub Actions workflow files to use ubuntu-slim as the runner image instead of ubuntu-latest across hassfest, precommit, tests, and validate workflows. No functional changes to workflow logic or steps.

Changes

Cohort / File(s)	Summary
GitHub Actions Runner Update .github/workflows/hassfest.yaml, precommit.yaml, tests.yaml, validate.yml	Runner image changed from ubuntu-latest to ubuntu-slim across all four workflow files. Each file contains a single-line modification affecting the runs-on configuration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Four workflows now slim and swift,
Ubuntu's leaner, lighter gift,
No logic changed, just runners lean,
The cleanest CI you've ever seen!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: moving all jobs from ubuntu-latest to ubuntu-slim runner across multiple workflow files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jwi-slimrunner

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.91%. Comparing base (c2a91dd) to head (3dc65a0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #612   +/-   ##
=======================================
  Coverage   96.91%   96.91%           
=======================================
  Files          16       16           
  Lines        1782     1782           
=======================================
  Hits         1727     1727           
  Misses         55       55           

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