Add `scope` argument to Catalog resources query

What does this MR do and why?

This MR adds a scope argument to the ciCatalogResources GraphQL query. The argument is a new ResourceScopeEnum that only has one option - all. More options will be added in upcoming MRs. The all option is the default and causes the query to return all catalog resources visible to the current user.

The legacy projectPath argument is now optional. It will still return only catalog resources within the given project's root namespace.

MR acceptance checklist

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Related to #429103 (closed)