Custom ESLint rules to enforce new ThemedComponent selector convention

The following cases are covered:
- ThemedComponent wrapper selectors must not start with ds-themed-
- Base component selectors must start with ds-base-
- Themed component selectors must start with ds-themed-
- The ThemedComponent wrapper must always be used in HTML
- The ThemedComponent wrapper must be used in TypeScript _where appropriate_:
  - Required
    - Explicit usages (e.g. modal instantiation, routing modules, ...)
    - By.css selector queries (in order to align with the HTML rule)
  - Unchecked
    - Non-routing modules (to ensure the components can be declared)
    - ViewChild hooks (since they need to attach to the underlying component)

All rules work with --fix to automatically migrate to the new convention
This covers most of the codebase, but minor manual adjustment are needed afterwards

.github/workflows/build.yml

@@ -85,8 +85,14 @@ jobs:
       - name: Install Yarn dependencies
         run: yarn install --frozen-lockfile
 
+      - name: Build lint plugins
+        run: yarn run build:lint
+
+      - name: Run lint plugin tests
+        run: yarn run test:lint:nobuild
+
       - name: Run lint
-        run: yarn run lint --quiet
+        run: yarn run lint:nobuild --quiet
 
       - name: Check for circular dependencies
         run: yarn run check-circ-deps