[IMPROVE] Add symbol to indicate apps' required settings in the UI #20447
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Proposed changes (including videos or screenshots)
Apps are able to define required settings. These settings should not be left blank by the user and an error will be thrown and shown in the interface if an user attempts to save changes in the app details page leaving any required fields blank;

A sign (*) is added to the label of app settings' fields that are required so as to highlight the fields which must not be left blank.

Issue(s)
Task - ClickUp, which is related to the PR #367 on the Apps-Engine's side.
Steps to test or reproduce
The setting fields for each app are listed in the App details screen, under the Apps section in the administration area (Administration > Apps > App's Name).
Further comments