chore: Simplify extension dependency injection

- Has better typing
- Removes use of unnusual unique symbol
- Fix welcome banner tests
    - Update associated snapshots
- Start converting custom column tests to use ApplicationBuilder
- Remove old and unnused RecursiveTreeView
- Introduce new TreeView for use in CatalogMenu to fix tests

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/core/src/features/status-bar/__snapshots__/status-bar-items-originating-from-extensions.test.tsx.snap

@@ -82,6 +82,7 @@ exports[`status-bar-items-originating-from-extensions when application starts wh
           >
             <i
               class="Icon logo svg focusable"
+              data-testid="no-welcome-banners-icon"
             >
               <span
                 class="icon"