Cherry-pick: Fixes for no-team.yml GitOps (#22210)

[lucasmrod]

Cherry pick for #22185

• Manual QA for all new/changed functionality

[getvictor]

LGTM

[lucasmrod]

Merging as the failing test is a flaky test.

[codecov]

Codecov Report

Attention: Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (minor-fleet-v4.57.0@a3232b2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
cmd/fleetctl/gitops.go	77.77%	1 Missing and 1 partial ⚠️
pkg/spec/gitops.go	66.66%	1 Missing and 1 partial ⚠️
server/service/client.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##             minor-fleet-v4.57.0   #22218   +/-   ##
======================================================
  Coverage                       ?   65.22%           
======================================================
  Files                          ?     1493           
  Lines                          ?   116990           
  Branches                       ?     3462           
======================================================
  Hits                           ?    76310           
  Misses                         ?    33561           
  Partials                       ?     7119           

Flag	Coverage Δ
backend	66.50% <68.42%> (?)

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