🔨 enh: Checking, if gitops repo (argo-hub) already exists

[PatrickLaabs]

/kind feature

Creating Argohub Repo out of Template Repo
GraphQL: Could not clone: Name already exists on this account (cloneTemplateRepository)

Cloning the new repository to the local working directory
Error cloning your Argohub Repo: repository already exists

Describe the solution you'd like
Implement a feature to check, if the repo already exists and skipping the clone process.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api-provider-vsphere version:
• Cluster-api-provider-azure version:
• Cluster-api-provider-docker version:
• Cluster-api-provider-harvester version:
• Cluster-api-provider-proxmox version:
• cluster-api-provider-vcluster version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):