Update paths after converting devextreme to monorepo (#854)

Author: alexslavr

.github/workflows/tests.yml

@@ -36,18 +36,22 @@ jobs:
       run: npm i --no-audit --no-fund
 
     - name: Build devextreme repo
-      working-directory: ../devextreme
+      working-directory: ../devextreme/packages/devextreme
       run: npm run build-npm-devextreme
 
+    - name: Build devextreme repo
+      working-directory: ../devextreme/packages/devextreme
+      run: npm run discover-declarations
+
     - name: Pack DevExtreme
-      working-directory: ../devextreme/artifacts/npm/devextreme
+      working-directory: ../devextreme/packages/devextreme/artifacts/npm/devextreme
       run: |
         npm pack
         mv devextreme*.tgz devextreme.tgz
 
     - name: Install devextreme package
       run: |
-        npm i --save-dev ../devextreme/artifacts/npm/devextreme/devextreme.tgz --workspace=devextreme-react --workspace=devextreme-react-sandbox --legacy-peer-deps --no-audit --no-fund
+        npm i --save-dev ../devextreme/packages/devextreme/artifacts/npm/devextreme/devextreme.tgz --workspace=devextreme-react --workspace=devextreme-react-sandbox --legacy-peer-deps --no-audit --no-fund
 
     - name: Run npm install
       run: npm i --legacy-peer-deps --no-audit --no-fund

package.json

@@ -48,7 +48,7 @@
     "test": "npm run update-integration-meta && npm run build && jest --coverage",
     "test-watch": "jest --watch",
     "pack": "npm run update-integration-meta && npm run pack --workspaces --if-present",
-    "update-integration-meta": "dx-tools integration-data-generator --js-scripts ../devextreme/js  --artifacts ../devextreme/artifacts/internal-tools --output-path ./packages/devextreme-react/metadata/integration-data.json --version 23_2"
+    "update-integration-meta": "dx-tools integration-data-generator --js-scripts ../devextreme/packages/devextreme/js  --artifacts ../devextreme/packages/devextreme/artifacts/internal-tools --output-path ./packages/devextreme-react/metadata/integration-data.json --version 23_2"
   },
   "keywords": [
     "react",