Handle not-logged-in public repos with credsStore #1650

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	11s
test (ubuntu-latest, 7.4.1, ., true)	25s
test (ubuntu-latest, 7.4.1, ., false)	40s
test (ubuntu-latest, 7.4.1, e2e/wasm, false)	26s
test (ubuntu-latest, 7.4.1, e2e/smoke, true)	18s
test (ubuntu-latest, 7.4.1, e2e/smoke, false)	19s
test (ubuntu-latest, 7.4.1, e2e/assertion, true)	1m 28s
test (ubuntu-latest, 6.4.0, ., true)	55s
test (ubuntu-latest, 6.4.0, ., false)	54s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	28s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	11s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	13s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	1m 54s
	8m 23s

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