feat(FR-1763): combine configurations and maintenance into single page.

[agatha197]

Resolves #4766 (FR-1763)

Move Maintenance Page to Settings Tab

This PR moves the Maintenance page functionality to the Settings page as a new tab. The standalone Maintenance page has been removed, and a redirect has been added for backward compatibility.

Changes include:

• Removed the dedicated MaintenancePage component
• Added Maintenance as a tab in the ConfigurationsPage
• Removed the Maintenance item from the sidebar menu
• Added a redirect from the old /maintenance path to /settings?tab=maintenance

Checklist:

• [ ] Documentation
• [ ] Minium required manager version
• [ ] Specific setting for review (eg., KB link, endpoint or how to setup)
• [ ] Minimum requirements to check during review
• [ ] Test case(s) to demonstrate the difference of before/after

[agatha197]

• #4767 👈 (View in Graphite)
• #4791
• main

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[github-actions[bot]]

Coverage report for ./react

St.:grey_question:	Category	Percentage	Covered / Total
🔴	Statements	4.4% (+0% 🔼)	520/11825
🔴	Branches	3.62%	302/8338
🔴	Functions	2.63% (+0% 🔼)	95/3616
🔴	Lines	4.37% (+0% 🔼)	506/11566

Test suite run success

145 tests passing in 14 suites.

Report generated by 🧪jest coverage report action from 02b3c1a5ed114b27db1c07877a88ad9452f62f30