feat(admin): notification tags rework

Description

feat(admin): notification tags rework

• notification_tags config option to customize available tabs for mail notification add/edit dialog
• the list of available tags is now connected to the selected mail type based on availability
• instead of clicking to add the tag to the current position, user now drags the tag to a desired location

DEPLOYMENT NOTE: new notification_tags config property

How to test

Try to create/edit mail notifications, change between the mail types, etc.

Author's checklist

• I have followed the contribution guidelines
• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Other information

N/A

Related issues

Closes STR-1438