[Boost] Update Minify/Concat CSS/JS UI

[thingalon]

Boost Cache's UI set some new standards for Boost's dashboard UI styling. @ederrengifo has made some UI tweaks to the Concatenate CSS/JS UI that we can apply easily to keep them consistent.

Ref: p1HpG7-r9A-p2#comment-70457

[github-actions[bot]]

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• [ ] p1HpG7-r9A-p2#comment-70457

[github-actions[bot]]

This issue has been marked as stale. This happened because:

• It has been inactive for the past 6 months.
• It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, `[Type] Feature Request`, `[Type] Enhancement`, `[Type] Janitorial`, `Good For Community`, `[Type] Good First Bug`, etc.

No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.