refactor: only pass --outDir flag when needed #2038

Job	Run time
matrix-prep	2s
test-worker (7, 7.1.1)	5m 55s
test (7, 7.1.1, 1, ubuntu, .)	1m 28s
test (7, 7.1.1, 1, ubuntu, e2e/bzlmod)	21s
test (7, 7.1.1, 1, ubuntu, e2e/external_dep)	24s
test (7, 7.1.1, 1, ubuntu, e2e/external_dep/app)	25s
test (7, 7.1.1, 1, ubuntu, e2e/worker)	23s
test (7, 7.1.1, 0, ubuntu, .)	1m 14s
test (7, 7.1.1, 0, ubuntu, e2e/external_dep)	20s
test (7, 7.1.1, 0, ubuntu, e2e/external_dep/app)	19s
test (7, 7.1.1, 0, ubuntu, e2e/worker)	25s
test (7, 7.1.1, 0, ubuntu, e2e/workspace)	19s
test (6, 6.5.0, 0, ubuntu, e2e/external_dep)	27s
test (6, 6.5.0, 0, ubuntu, e2e/external_dep/app)	22s
test (6, 6.5.0, 0, ubuntu, e2e/worker)	24s
test (6, 6.5.0, 0, ubuntu, e2e/workspace)	24s
conclusion	5s
	13m 17s

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