[Epic][SURE-5542] Rancher Projects support

[kkaempf]

Related:

• Feature Request: Support ClusterLabels for namespaceLabels in fleet.yaml #4140
• [SURE-10633] Add allowedTargetNamespaceSelector in the GitRepoRestriction resource #4300
• Feature Request: To be able to separate customer projects from each other ie. not seeing each others git repos #2176