[UI] Templates: Support correctly displaying template form if multiple templates with the same name in diff namespace

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e.g.

• name: foo, namespace: bar
• name: foo, namespace: foo

You cannot select and fill out the 2nd template in this case.

e.g. we ignore namespace in the url right now: https://pesto-demo-01.eng-sandbox.weave.works/templates/vcluster-template-development/create

What to do?

• namespace in the path somehow?
• adopt the same "details" path that OSS does: /templates?name=&namespace=&clusterName?

https://github.com/weaveworks/weave-gitops-interlock/issues/451

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Tracked in linked issue