hotspot-manager: show a notification when an error occurs

Ratchanan Srirattanametrequested to merge
personal/peat-psuwit/hotspot-error-notification into main

This should improve user experience when enabling hotspot fails.

When enable via indicator When enable via lomiri-system-settings
screenshot20230428_020455112 screenshot20230428_020510234
Edited by Ratchanan Srirattanamet

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