Remove global poetry export addition

Author: ArBridgeman

.github/workflows/slow-checks.yml

@@ -37,9 +37,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Run Tests and Collect Coverage
-        run: |
-          poetry self add poetry-plugin-export
-          poetry run -- nox -s test:integration -- --coverage --db-version ${{ matrix.exasol-version }}
+        run: poetry run -- nox -s test:integration -- --coverage --db-version ${{ matrix.exasol-version }}
 
       - name: Upload Artifacts
         uses: actions/[email protected]