fix(Tenants): show create DB button only when table is loaded

[artemmufazalov]

Closes #2115

CI Results

Test Status: ⚠️ FLAKY

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
318	317	0	1	0

😟 No changes in tests. 😕

Bundle Size: ✅

Current: 83.36 MB | Main: 83.36 MB
Diff: +0.07 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 refactors the condition for displaying the "Create DB" button in the Tenants component so that it only appears when the table has finished loading.

• Refactors the condition by extracting a local variable for clarity
• Adds a check for table loading state before rendering the button

Comments suppressed due to low confidence (1)

src/containers/Tenants/Tenants.tsx:92

• [nitpick] Consider renaming 'buttonAvailable' to 'isCreateDBButtonVisible' for enhanced clarity in conveying its purpose.

if (buttonAvailable && !loading) {