Improve device user account creation during MDM IdP enrollment flow

[gillespi314]

Note

This PR already merged in main, see #20162. This is against the release branch so it can be included in 4.54.0

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Please upload report for BASE (minor-fleet-v4.54.0@14722e6). Learn more about missing BASE report.

Files	Patch %	Lines
frontend/utilities/endpoints.ts	0.00%	3 Missing ⚠️
frontend/services/entities/mdm.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##             minor-fleet-v4.54.0   #20353   +/-   ##
======================================================
  Coverage                       ?   37.01%           
======================================================
  Files                          ?     1409           
  Lines                          ?   131890           
  Branches                       ?     3202           
======================================================
  Hits                           ?    48819           
  Misses                         ?    78684           
  Partials                       ?     4387           

Flag	Coverage Δ
frontend	52.25% <0.00%> (?)

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