[bug] Concat Helm chart + Helm repo should verify no double slashes

[e-minguez]

this fails:

      # SUSE AI Factory preview
      - chart: "aif-operator"
        version: "0.1.0-dev.1"
        namespace: "aif-operator"
        repository: "ghcr-suse"
    repositories:
      - name: "ghcr-suse"
        url: "oci://ghcr.io/suse/chart/"

because:

+ echo 'Installing helm chart'
+ helm install --namespace aif-operator --create-namespace --version 0.1.0-dev.1 aif-operator oci://ghcr.io/suse/chart//aif-operator
Error: INSTALLATION FAILED: invalid reference: invalid repository "suse/chart//aif-operator"

so the extra /  seems to be a problem