feat: Possible to skip cosign toolchains registration (#733) #1625

Job	Run time
matrix-prep-bazelversion	4s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	3m 43s
test (ubuntu-latest, 7.1.1, ., false)	6m 39s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 11s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	26s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 29s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 38s
test (ubuntu-latest, 6.4.0, ., true)	4m 35s
test (ubuntu-latest, 6.4.0, ., false)	7m 30s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 44s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	17s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 28s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	5m 19s
test (macos-13, 7.1.1, ., true)	7m 7s
test (macos-13, 7.1.1, ., false)	8m 4s
test (macos-13, 7.1.1, e2e/smoke, true)	43s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 52s
	1h 3m 50s

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