Add usage quota page test for free user cap user removal
What does this MR do and why?
Adds a test to verify ability to remove users on usage quota page while in read only. See #384970 as to why we might want to do this
Also refactors a bit of the code for readability while we are at it.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #384970
Edited by Doug Stull