🧹 chore: Migrate to Flat ESLint Config & Update Prettier Settings (#5737)

* chore: migrated eslint v8 to v9

* chore: migrated eslint v8 to v9

* ESLint only checks the files that have changed in the pull request.

* fix: ESLint only checks the files that have changed in the pull request.

* refactor: eslint only on changed files

* refactor: eslint only on changed files or added files

* refactor: eslint only on changed files or added files

* refactor: eslint only on changed files or added files

but only include files that are not deleted (ACMRTUXB: A, C, M, R, T, U, X, B).

* whoops missed something

.github/workflows/backend-review.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Install MCP Package
         run: npm run build:mcp
-      
+
       - name: Create empty auth.json file
         run: |
           mkdir -p api/data
@@ -61,9 +61,4 @@ jobs:
         run: cd api && npm run test:ci
 
       - name: Run librechat-data-provider unit tests
-        run: cd packages/data-provider && npm run test:ci
-
-      - name: Run linters
-        uses: wearerequired/lint-action@v2
-        with:
-          eslint: true
+        run: cd packages/data-provider && npm run test:ci