[Bug] Stop collection generation if rule was removed

[8a8al00ey]

Describe the bug
If a rule is remove while a collection job is running it will continue to try to add the media item to plex collection even though it was removed.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Rules'
2. Click on 'Run rules'
3. Go to 'Rules'
4. Click on 'Delete rule'

Expected behavior
Be able to remove rules and not have it continue to try to add the media item to a collection that was already deleted.

[Nest] 63  - 02/09/2023, 5:03:11 PM     LOG [CollectionsService] Adding media with id 41026 to collection..
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [PlexApiService] Removed collection from Plex
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [CollectionsService] Removing collection from Database..
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [CollectionsService] Adding media with id 285754 to collection..
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [RulesService] Removed rulegroup with id 7 from the database
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [CollectionsService] Couldn't add media to collection: Error: Plex Server didnt respond with a valid 2xx status code, response code: 404
[Nest] 63  - 02/09/2023, 5:03:12 PM     LOG [CollectionsService] Adding media with id 25276 to collection..