Gitlab repository: support both the project ID and the escaped full path

[aetertinas9]

🐛 https://github.com/kubernetes-sigs/cluster-api/pull/9481 This is a bug that occurred in the above link and has not been resolved for a long time. However, it needs to be included in the release version, so I am opening a new issue. **What this PR does / why we need it**: Using GitLab as per the [docs](https://cluster-api.sigs.k8s.io/clusterctl/provider-contract.html?highlight=gitlab#provider-repositories), it supports both the project ID and the escaped full path. **Which issue(s) this PR fixes** *(optional, in `fixes #(, fixes #, ...)` format, will close the issue(s) when PR gets merged)*: Fixes https://github.com/kubernetes-sigs/cluster-api/issues/10605

/area clusterctl https://github.com/kubernetes-sigs/cluster-api/labels/area%2Fclusterctl

[linux-foundation-easycla[bot]]

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