fix(devcontainer): use the default shell on Windows for `initalizeCommand` #1726

Job	Run time
test-e2e-windows (build)	2m 19s
test-e2e (build)	11m 25s
test-e2e-windows (ide)	1s
test-e2e (ide)	11m 16s
test-e2e-windows (ssh)	1s
test-e2e (integration)	10m 30s
test-e2e-windows (up-docker)	1s
test-e2e (machine)	10m 7s
test-e2e-windows (up-docker-build)	1s
test-e2e (machineprovider)	11m 10s
test-e2e (provider)	10m 10s
test-e2e-windows (up-docker-compose)	1s
test-e2e (proxyprovider)	11m 8s
test-e2e (ssh)	10m 18s
test-e2e (up)	13m 42s
test-e2e (up-docker)	12m 17s
test-e2e (up-podman)	10m 28s
test-e2e (up-docker-compose)	12m 39s
test-e2e (up-docker-build)	10m 58s
test-e2e (up-docker-compose-build)	11m 21s
test-e2e (context)	10m 4s
	2h 49m 57s

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