Handle not-logged-in public repos with credsStore #1651

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	5s
test (ubuntu-latest, 7.4.1, ., true)	6m 42s
test (ubuntu-latest, 7.4.1, ., false)	4m 1s
test (ubuntu-latest, 7.4.1, e2e/wasm, false)	4m 13s
test (ubuntu-latest, 7.4.1, e2e/smoke, true)	16s
test (ubuntu-latest, 7.4.1, e2e/smoke, false)	2m 30s
test (ubuntu-latest, 7.4.1, e2e/assertion, true)	3m 50s
test (ubuntu-latest, 6.4.0, ., true)	4m 36s
test (ubuntu-latest, 6.4.0, ., false)	7m 7s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	3m 3s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	2m 29s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	22s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	3m 55s
	43m 10s

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