Controller tests intermittently failing at CI

[pjbgf]

At some point between v0.25.9 and v0.25.10 the controller tests started to intermittently fail at CI.

Symptom

panic: Failed to stop the test environment: timeout waiting for process kube-apiserver to stop
goroutine 1 [running]:
github.com/fluxcd/source-controller/controllers.TestMain(0x0)
	/Users/runner/work/source-controller/source-controller/controllers/suite_test.go:279 +0x1b7d
main.main()
	_testmain.go:217 +0x365

Occurrences

https://github.com/fluxcd/source-controller/runs/7359346356?check_suite_focus=true#step:5:954 [ macOS ]
https://github.com/fluxcd/source-controller/runs/7411478752?check_suite_focus=true#step:5:956 [ macOS ]
https://github.com/fluxcd/source-controller/runs/7357153944?check_suite_focus=true#step:5:954 [ macOS ]
https://github.com/fluxcd/source-controller/runs/7427880663?check_suite_focus=true#step:5:944 [ linux ]

[hiddeco]

xref for easy comparison: v0.25.9...v0.25.10