Remove unnecessary build steps from integration test workflow

Now that the development policy is to continuously package the project, and this policy is enforced by a CI workflow,
The action will always be pre-built, so building it again during the integration test workflow runs is pointless.

One of the build steps was removed from the workflow at the time the development policy was changed, but the build
steps in the other two jobs were missed at that time.

Author: per1234

.github/workflows/integration.yml

@@ -36,12 +36,6 @@ jobs:
       - name: Checkout local repository
         uses: actions/checkout@v2
 
-      - name: Build action
-        run: |
-          npm install
-          npm run build
-          npm run pack
-
       # The contents of the test data path are structured so that the step will fail if arduino-lint is not run with the configuration according to these inputs.
       - name: Run action
         uses: ./
@@ -65,12 +59,6 @@ jobs:
       - name: Checkout local repository
         uses: actions/checkout@v2
 
-      - name: Build action
-        run: |
-          npm install
-          npm run build
-          npm run pack
-
       # The contents of the test data path are structured so that the step will fail if arduino-lint is run with the default configuration.
       - name: Run action
         id: arduino-lint