Fix CI cache generation workflows

[Xeratec]

Fix broken CI cache generation by adding missing shell: bash directive and correcting a test case reference.

See below for successful cache generation actions:

• GAP9: https://github.com/pulp-platform/Deeploy/actions/runs/23290279441
• Others: https://github.com/pulp-platform/Deeploy/actions/runs/23290526544

Changed

• Added shell: bash to the "Generate CCache" step in infra-generate-ccache.yml to ensure correct shell execution
• Added shell: bash to the "Generate CCache for GAP9" step in infra-generate-ccache-gap9.yml to ensure correct shell execution

Fixed

• Fixed wrong test case in GAP9 ccache workflow: replaced test_gap9_tiled_kernels_l2_singlebuffer[Kernels/Integer/Add/Large-5000-L2-singlebuffer] with test_gap9_tiled_kernels_l2_singlebuffer[Kernels/Integer/MatMul/Regular-64000-L2-singlebuffer]

PR Merge Checklist

1. The PR is rebased on the latest devel commit and pointing to devel.
2. Your PR reviewed and approved.
3. All checks are passing.
4. The CHANGELOG.md file has been updated.
5. If the docker was modified, change back its link after review.

[coderabbitai]

📝 Walkthrough

Walkthrough

Added explicit shell: bash to two GitHub Actions workflow steps and corrected a GAP9 pytest target in the GAP9 cache-generation workflow; also recorded these changes in CHANGELOG.md.

Changes

Cohort / File(s)	Summary
GAP9 cache workflow .github/workflows/infra-generate-ccache-gap9.yml	Added shell: bash to the "Generate CCache for GAP9" step and changed the pytest target from Kernels/Integer/Add/Large-5000-L2-singlebuffer to Kernels/Integer/MatMul/Regular-64000-L2-singlebuffer.
Generic cache workflow .github/workflows/infra-generate-ccache.yml	Added shell: bash to the "Generate CCache" step so the multi-line run script executes under Bash.
Changelog CHANGELOG.md	Recorded an Unreleased entry "Fix CI Cache Generation [#176]" and noted the two fixes: explicit shell: bash directives and the GAP9 test target correction.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Suggested reviewers

• runwangdl
• Victor-Jung

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing CI cache generation workflows by adding shell directives and correcting a test reference.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining the fixes to CI cache generation workflows and providing relevant context.

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

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch wiese/fix_ci_cache

📝 Coding Plan

• Generate coding plan for human review comments

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[Victor-Jung]

LGTM