Bug 1966632

This bug was initially created as a copy of Bug #1947154

I am copying this bug because: 



Description of problem:
If a SNO instance is in the process of installing openshift onto the node (Using Assisted Service Operator + CRDs), if the instance is removed by deleting relevant CRDs (ClusterDeploy / InstallEnv / Agent), it is not possible re-register+install the same node until the installation has timed out or been manually aborted.

Version-Release number of selected component (if applicable):
Assisted Service Master (commit 5bc8d7ef053110bb3da7be9460284e930eb03b1e)

How reproducible:
100%

Steps to Reproduce:
1. Deploy an SNO cluster via CRDs + Assisted Operator
2. Delete the relevant CRDs while it is installing
3. Attempt to reapply the CRDs + start the SNO machine with a new discover ISO

Actual results:
- Agents fail to start on SNO Machine and agent cr is not created
- ClusterDeployment CR says the state is "installing"

Assisted Service pod logs:
time="2021-04-07T19:07:41Z" level=error msg="failed to deregister cluster: sno-cluster-deployment: cluster 40a22dbd-d424-40dd-9100-13108fd5323b can not be removed while being installed" func="github.com/openshift/assisted-service/internal/controller/controllers.(*ClusterDeploymentsReconciler).deregisterClusterIfNeeded.func1" file="/go/src/github.com/openshift/origin/internal/controller/controllers/clusterdeployments_controller.go:652"
time="2021-04-07T19:07:46Z" level=info msg="Deregister cluster id 40a22dbd-d424-40dd-9100-13108fd5323b" func="github.com/openshift/assisted-service/internal/bminventory.(*bareMetalInventory).DeregisterClusterInternal" file="/go/src/github.com/openshift/origin/internal/bminventory/inventory.go:655" go-id=841 pkg=Inventory request_id=
time="2021-04-07T19:07:47Z" level=error msg="failed to deregister cluster 40a22dbd-d424-40dd-9100-13108fd5323b" func="github.com/openshift/assisted-service/internal/bminventory.(*bareMetalInventory).DeregisterClusterInternal" file="/go/src/github.com/openshift/origin/internal/bminventory/inventory.go:674" error="cluster 40a22dbd-d424-40dd-9100-13108fd5323b can not be removed while being installed" go-id=841 pkg=Inventory request_id=



Expected results:
Installation is halted immediately (Aborted automatically?)

Additional info:

Although the issue is alluded to in the assisted service pods, I did not 100% realize what was happening until I checked the assisted ui, which I should NOT need to do. It's a confusing situation.