fix(EntityStatus): fix buttons bg in selected table rows

[artemmufazalov]

Copy buttons in selected rows in partitions have wrong background.

Deleted additional background colors from EntityStatus styles, it seems everything OK without them.

CI Results

Test Status: ⚠️ FLAKY

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
378	373	0	3	2

Test Changes Summary ⏭️2

⏭️ Skipped Tests (2)

1. Scroll to row, get shareable link, navigate to URL and verify row is scrolled into view (tenant/diagnostics/tabs/queries.test.ts)
2. Copy result button copies to clipboard (tenant/queryEditor/queryEditor.test.ts)

Bundle Size: ✅

Current: 85.37 MB | Main: 85.37 MB
Diff: 0.30 KB (-0.00%)

✅ Bundle size unchanged.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
• 📊 indicates links to detailed reports.
• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.

[Copilot]

Pull Request Overview

This PR fixes a visual issue where copy buttons in selected table rows for partitions had incorrect background colors. The fix removes unnecessary background color styles from the EntityStatus component that were interfering with proper table row styling.

• Removes hardcoded background colors from EntityStatus buttons in visible and hover states
• Allows table row selection styling to work properly without background color conflicts