ci: cache prek instead of pre-commit in copier-template-tester

[tsvikas]

The rendered project switched from pre-commit to prek in e397011, but the copier-template-tester job still cached ~/.cache/pre-commit. That directory is never created during uv run ctt (the rendered projects' tasks run prek, which caches under ~/.cache/prek), so the cache save found nothing and actions/cache warned about a non-existent path.

Point the cache at ~/.cache/prek and key it on the rendered pre-commit config template. Drop the top-level .pre-commit-config.yaml from the key: it governs the separate pre-commit job, not the hooks prek installs in rendered projects.

Claude-Session: https://claude.ai/code/session_01VnSA7mKDr3hkDCxZeUvFZY

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider using $HOME/.cache/prek instead of ~/.cache/prek in the cache path for better portability and to avoid any issues with shell expansion in different contexts.
• It may be worth including the prek version (or a relevant lockfile) in the cache key to avoid reusing incompatible caches across prek upgrades.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider using $HOME/.cache/prek instead of ~/.cache/prek in the cache path for better portability and to avoid any issues with shell expansion in different contexts.
- It may be worth including the prek version (or a relevant lockfile) in the cache key to avoid reusing incompatible caches across prek upgrades.

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