ci: add clean cache and pull request title validation workflow

[dammy001]

Description

This PR adds

• clean cache workflow. https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries.
• Validate PR title workflow

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• [ ] It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• [ ] Ideally, include a test that fails without this PR but passes with it.
• [ ] Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• [x] Run the tests with pnpm test:ci.

Documentation

• [ ] If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• [x] Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

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[sheremet-va]

I don't really understand the purpose of this PR, to be honest. What cache does it clear and don't we already do that? For PR titles, I don't think we should be too strict there since I can always rename any PR before merging.

[sheremet-va]

The team decided that this is not needed. The cache is already in place and we control the name of the PR when merging