Add comment property to service provider for editor notes

[Sebobo]

We have several disabled service provider entries, and it would be helpful to know why those are disabled.
Some are temporarily hidden, some wait for more data / feedback, etc.

Either by adding a inspector field with some notes or using something like https://github.com/networkteam/Networkteam.ContentComments.

[tschoeki]

I like the idea of having this information right at the corresponding entry, e.g. with the link to the Zammad ticket

[crydotsnake]

Good idea !

[jonnitto]

I made a PR there to remove the unused CSS if the rendering in the frontend is disabled: networkteam/Networkteam.ContentComments#54