Hotfix: Remove some transients on plugin (de-)activation

[ScreamingDev]

What has changed?

• Transienst will be deleted on plugin (de-)activation

Please read the commit messages for details.

Things to review

Common things:

• [ ] Works fine.
• [x] Changelog written or not needed.
• [x] No conflict with current branch.

Got an idea while looking at the GUI? Please add a new issue refering to this one.

[ScreamingDev]

Changed to deactivation only @andrecedik . Good to merge?

[andrecedik]

:shipit: Go for it @ScreamingDev 👍