Fix Actions Storage Cleanup: paginate calls fail with empty owner/repo

[Copilot]

github.paginate(github.request, 'GET /repos/{owner}/{repo}/...', { owner, repo }) does not resolve URL template variables — the actual request URL becomes https://api.github.com/repos///actions/workflows, resulting in a 404.

Changes

• Replace all three github.paginate(github.request, ...) calls with the correct github.rest.* endpoint methods, which properly interpolate owner/repo and handle pagination:

// Before (broken)
github.paginate(github.request, 'GET /repos/{owner}/{repo}/actions/workflows', { owner, repo, per_page: 100 })

// After
github.paginate(github.rest.actions.listRepoWorkflows, { owner, repo, per_page: 100 })

Affected calls:

• listRepoWorkflows
• listWorkflowRuns
• getActionsCacheList

The github.request(...) DELETE calls are unaffected — template interpolation works correctly there.

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