Enable ciCatalogResource endpoint to accept a fullpath argument

What does this MR do and why?

Currently ciCatalogResource accepts GID to query for resources by id. This MR enables the endpoint to also accept full_path (project's full path) argument to query for resource.

This MR resolves #429100 (closed)

Screenshots or screen recordings

Query via GID (exisiting behaviour) Query via full_path (introduced by this MR) Query via full_path for a catalog resource where the project is not a catalog resource (introduced by this MR) Query without any arguments passed (introduced by this MR) Query with both arguments

1. Checkout this branch and restart your server.
2. Create a catalog resource e.g.: Typeahead.Js
3. Run the following queries from your local host http://127.0.0.1:3000/-/graphql-explorer Query via GID (exisiting behaviour)

query getCiCatalogResource($id: CiCatalogResourceID = "gid://gitlab/Ci::Catalog::Resource/1") 
{
  ciCatalogResource(id: $id) {
    id
    icon
    name
    description
    openIssuesCount
    openMergeRequestsCount 
  } 
}

Query via full_path (introduced by this MR)

query getCiCatalogResource($full_path: ID = "twitter/Typeahead.Js") 
{
  ciCatalogResource(fullPath: $full_path) {
    id
    icon
    name
    description
    openIssuesCount
    openMergeRequestsCount 
  } 
}

Query without any arguments passed (introduced by this MR)

query getCiCatalogResource
{
  ciCatalogResource {
    id
    icon
    name
    description
    openIssuesCount
    openMergeRequestsCount 
  } 
}

Query via full_path for a catalog resource where the project is not a catalog resource (introduced by this MR)

query getCiCatalogResource($full_path: ID = "kasia-group/kasia-pro") 
{
  ciCatalogResource(fullPath: $full_path) {
    id
    icon
    name
    description
    openIssuesCount
    openMergeRequestsCount 
  } 
}

Query with both arguments should return an error.

query getCiCatalogResource($id: CiCatalogResourceID = "gid://gitlab/Ci::Catalog::Resource/1", $full_path: ID = "Typeahead.Js") 
{
  ciCatalogResource(id: $id, fullPath: $full_path) {
    id
    icon
    name
    description
    openIssuesCount
    openMergeRequestsCount 
  } 
}

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