Enable configuring supported data sources

[neon-balcony]

From Discord:
FalkWolsky
How could we add / remove the data source plugins? For example S3 is cool, but Oracle DB driver my team don't need. As it is currently "per default" there, it fills up the UI with non necessary elements - as the backend code too.
Simply removing the Folders won't work. But maybe to have a deployment option where one can define which standard plugins to use and which not?

neon_balcony
Currently this data source list is hard coded in our source code, so ignoring them in the docker file (as @Groomsh pointed out) would cause problems when you'll still find the omitted icons in your editor and get an instant error after you click on them. As this is quite a reasonable request, we'll consider make it configurable in env file or a page containing a list of switches for workspace admins to manually toggle.