fix: remove vite.config.mts.timestamp from project

[PatrykKuniczak]

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Priority*

• [ ] High: This PR needs to be merged first for other tasks.
• [x] Middle: This PR should be merged quickly to prevent conflicts due to common changes. (default)
• [ ] Low: This PR does not affect other tasks, so it can be merged later.

Purpose of the PR*

As i've described there: https://github.com/Jonghakseo/chrome-extension-boilerplate-react-vite/issues/720#issuecomment-2365303711

Changes*

I've removed vite.config.mts.timestamp pattern from .gitignore and I've created script for cleaning up all timestamp files