Require bash on Windows. Throw error if missing #5462

Job	Run time
build-and-check	2m 24s
test-integration-packages/billing	39s
test-integration-packages/internal	38s
test-integration-sdk	40s
test-integration-common	43s
test-packages/internal	47s
test-integration-packages/agent-runtime	35s
test-packages/agent-runtime	1m 2s
test-cli	1m 16s
test-sdk	51s
test-integration-cli	44s
test-common	46s
test-web	46s
test-integration-.agents	41s
test-packages/billing	45s
test-.agents	40s
test-integration-web	41s
	14m 38s

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