Disable file-25,26,27,28 from being allocated new repos

Production Change - Criticality 2 C2

Change Objective	Stem the growth of repositories onto these mostly full gitaly nodes.
Change Type	C2
Services Impacted	Gitaly storage
Change Team Members	@cmcfarland
Change Severity	~S3
Buddy check	A colleague will review the change
Tested in staging	Is there a way to "test" this?
Schedule of the change	8:50am EDT
Duration of the change	10 minutes
Detailed steps for the change. Each step must include:	See below

Remove file 25, 26, 27 and 28 from the list of nodes selected for new and renamed projects. This change is made in the admin interface under Admin Area -> Repository -> Repository storage