[QE] Set env var windows

[albfan]

Description

CI sets some configurations using env var, FOO=bar, but windows do not support that format, it should be $env:FOO=bar;

Fixes: #4618

[openshift-ci]

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[rohanKanojia]

Do you think we can replace this switch statement like this?

Suggested change

	switch value {
	case "true":
	value = "$true"
	break
	case "false":
	value = "$false"
	break
	default:
	}
	value = fmt.Sprintf("$%s", value)

[anjannath]

maybe the function should be called SetBoolEnvVariable then, because we want to append the $ only in case of bool values

[openshift-ci]

@albfan: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration-crc	f101751	link	true	/test integration-crc
ci/prow/e2e-crc	f101751	link	true	/test e2e-crc
ci/prow/images	f101751	link	true	/test images
ci/prow/security	f101751	link	false	/test security
ci/prow/e2e-microshift-crc	f101751	link	true	/test e2e-microshift-crc

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[anjannath]

could you please add some details to the commit log why this is needed now or what this fixes