refactor: clean up variables and messages #901

Job	Run time
matrix-prep-bazelversion	3s
test-auth	2m 30s
test (ubuntu-latest, 6.2.0, ., true)	4m 48s
test (ubuntu-latest, 6.2.0, ., false)	5m 0s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	1m 45s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	1m 19s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	1m 2s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	46s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	18s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	15s
test (ubuntu-latest, 5.3.2, ., false)	5m 59s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	1m 57s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	1m 12s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	50s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	26s
	28m 10s

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