Support OCI cloud credential for rke2 clusters

[sowmyav27]

We have its support for RKE1 cluster, so we need it for rke2 clusters as well.

[nwmac]

@gaktive Is this 2.6.2?

[gaktive]

@nwmac I think this is 2.6.3 since this is tied to cluster prov v2, which got pushed out further.
@Jono-SUSE-Rancher am I correct?

[gaktive]

Credentials could be common between containers and virtual machines.

[gaktive]

This will likely have to come from external contributors. I'll check with @deniseschannon about who.

[jlamillan]

Hey @gaktive. I am the author of the OKE cluster and OCI node drivers for Rancher.

[gaktive]

Should be done as part of #3263

[Auston-Ivison-Suse]

Validation Setup
rancher version: v2.6-(head)
Chrome version:99.0.4844.74

Pre-reqs: Have the oke driver activated within "cluster drivers"

To Validate

1. Create a cloud credential within the rke2 create option
2. Create the cluster
   Results

You can check the credentials and see that the appropriate fields populate.

The appropriate keys are as follows:
-fingerprint
-tenancyID
-userId
-privateKeyContents

Post creation, check the cloud credentials, the key.

I saw the appropriate PUT request get filled with the inputs I had in the fields.