Better labeling for 3rd party provisioners

[ebauman]

Currently, HobbyFarm requires that for any 3rd party provisioner (e.g. not internal terraform), that the environment be labeled with hobbyfarm.io/provisioner=external
This forces all 3rd party provisioners to receive a VM annotated with that label which does no good if you want to separate out those VMs by provisioner.
This PR changes the logic for labeling such that any VM labeled with a non-empty (!= "") hobbyfarm.io/provisioner label will be treated as external.
Only those VMs that have either an empty label or a nonexistent label of hobbyfarm.io/provisioner will be handled by the internal TFP.

• go mod tidy
• switched to "not internal"
• changed to use label set instead of "internal"

[ebauman]

Anything in this PR not related to the provisioner label is a result of GoLand running gofmt
or me running go mod tidy

[jggoebel]

Might be safe to merge this after merging the microservice pr. I do not think it would break anything but it could produce more conflicts

[ebauman]

yeah that's fine, just needs to go in before we can publish any of the 3rd party provisioners.
eventually the logic will get overhauled for our VM provisioning stuff but that's not there yet.

[ebauman]

There was a race condition in this PR where immediately upon VM creation, the status of the VM would be updated by the 3rd party provisioner. This conflicted with Gargantua trying to write some status details. Gargantua did not have a conflict retry mechanism so the session failed and was deleted.