Add notification when collection is being created

[alesan99]

Fixes #7825

Adds a very simple informative notification when you create a collection through the System Configuration tool.

For code simplicity, it does not show the name of the collection nor a message when the collection is complete. Implementing those would require some structural changes.

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list
• Add automated tests

Testing instructions

• Open the System Configuration Tool
• Create a new discipline
• Create a new collection within that discipline
• See that the notification shows up
• See that the notification only shows up for collections

Feel welcome to request changes if you don't find this solution satisfactory, and I can spend more time on it.

[emenslin]

• See that the notification shows up
• See that the notification only shows up for collections

This does work, however, the notification says "allow up to 15 minutes for it to become available", but if you're adding multiple collections it can take longer than that. I added 2 new disciplines, 4 collections, 1 pre-loaded taxon, and 1 pre-loaded geography tree, and it took ~25 minutes for the last collection to be added. The wording of the notification should be changed to be more inclusive to possible longer time periods depending on how many collections are being created at once.

In this video, there are 4 collections that can be logged into, but a total of 6 collections are in the DB, and it has been >15 minutes since the last collection was created.

03-23_08.58.mp4