Set a homepage before deleting the current one

[fcoveram]

What problem does this address?

In tickets #63666 and #63667, the flow of deleting a page set as homepage is not included in the designs. The use case is likely small and having a homepage set is required, yet the scenario exists and we aim for avoiding dead-ends.

What is your proposed solution?

From the same tickets mentioned above, and also related to #60772, this idea shows the "move to trash" action in a disabled state with a help text indicating that a new homepage needs to be set first.

CleanShot.2024-12-19.at.11.01.51.mp4

As an alternative, this second version allows users to delete the page, but it triggers a page replacement modal that pulls in the actions of selecting a new homepage in a single view.

CleanShot.2024-12-19.at.11.05.25.mp4

[benazeer-ben]

This PR will disable the deletion of specific pages such as front page and home page based on this ticket.