[UX] Add help text on "uninstall modules" page /admin/modules/uninstall that modules need to be disabled first

Description of the need

On the page /admin/modules/uninstall modules are not listed. In order to see modules there they need to be disabled first.

Proposed solution

Add help text explaining how to disable modules.

GitHub Link:

https://github.com/backdrop/backdrop-issues/issues/6309

GitHub Issue #:

6309

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