[CI] Yarn install composite action remove --immutable-cache

[prastoin]

Encountered a false positive on the following run https://github.com/twentyhq/twenty/actions/runs/12790903292/job/35657751508
Checking for the cache

[greptile-apps]

PR Summary

Modified yarn install configuration by removing the --immutable-cache flag while retaining --immutable and --check-cache flags in the CI workflow.

• Updated .github/workflows/actions/yarn-install/action.yaml to allow cache modifications during installation while maintaining lockfile integrity
• Added yarn config set enableHardenedMode true for enhanced security during package installation
• Improved caching strategy by using actions/cache/restore@v4 and actions/cache/save@v4 for node_modules

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[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-c0c6a1bd.json

Generated by 🚫 dangerJS against b0426d5