Prefer git bash in windows to wls bash #5477

Job	Run time
build-and-check	2m 24s
test-cli	1m 17s
test-.agents	38s
test-integration-packages/internal	40s
test-integration-packages/agent-runtime	40s
test-integration-.agents	34s
test-packages/billing	39s
test-integration-sdk	34s
test-packages/internal	46s
test-integration-cli	41s
test-packages/agent-runtime	55s
test-integration-packages/billing	39s
test-common	40s
test-sdk	50s
test-integration-common	39s
test-web	43s
test-integration-web	40s
	13m 59s

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