Pending Location information added to Dark Theme

Resolved an issue in Settings where sunset/sunrise dark mode failed silently when a location was unavailable. Now, an error dialog is shown, even if location services are enabled, but a specific location is missing.

A footer stating the same issue is now present while the location is pending.

Existing banner that appears when Location is disabled is now being removed once Location is turned on. Previously the UI would refresh only after exiting and returning to the preference view.

Bug: 324548844
Bug: 402025928
Test: atest UiModeManagerServiceTest
Flag: EXEMPT bugfix
Change-Id: I914937185f11a686b453f929728b6329ebd05389