Refactor and implement shared integration test host #20061

Job	Run time
Build and publish container images	6m 23s
Publish Radius bicep types to ACR	1m 27s
Build linux_arm binaries	3m 59s
Build linux_arm64 binaries	4m 20s
Build linux_amd64 binaries	11m 3s
Build windows_amd64 binaries	4m 24s
Build darwin_amd64 binaries	4m 30s
Build darwin_arm64 binaries	4m 18s
Helm chart build	0s
Publish GitHub Release	0s
	40m 24s

Provide feedback