add mgmt cluster description to prov cluster description as fallback in home cluster list and main side nav clusters

[aalves08]

Summary

Fixes #10441 (based on reopening from QA by comment #10441 (comment))

Occurred changes and/or fixed issues

• add mgmt cluster description to prov cluster description as fallback in home cluster list and main side nav clusters

Technical notes summary

Descriptions were not appearing because both lists are based on CAPI clusters and the ones mentioned by QA are MGMT clusters. Added the MGMT clusters to the home cluster list and main side nav clusters

Areas or cases that should be tested

• Edit local cluster and add a description
• Provision a AKS, EKS or GKE cluster with a description
• make sure description appears in the home page cluster list and main side nav clusters

Areas which could experience regressions

Screenshot/Video

Checklist

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[momesgin]

I tested with an AKS cluster and LGTM

[aalves08]

@izaac @yonasberhe23 I've added some coverage for this under the RKE1 amazon EC2 cluster provisioning. I did my best to test this fully but it needs a remote instance (couldn't test against this branch env) so the only I didn't test was reading the description from the home page cluster list, but that has been covered previously so I don't think it will put us into any problems. Just for FYI if you notice anything weird (Idk if this test in particular runs on our pipeline or not). 🙏