[Refactor] Create Fragment to encapsulate Workspaces fields

Issue: [Refactor] Create Fragment to encapsulate commo... (#443619 - closed)

What does this MR do and why?

Implements Graphql cleanup described in [Refactor] Create Fragment to encapsulate commo... (#443619 - closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

All tests should pass.

Related to #443619 (closed)

ee/app/assets/javascripts/remote_development/graphql/fragments/workspace_item.fragment.graphql

+fragment WorkspaceItem on Workspace {
+  id
+  name
+  namespace
+  projectId
+  desiredState
+  actualState
+  url
+  devfileRef
+  devfilePath
+  devfileWebUrl
+  createdAt
+}