Added Poetry cache clearing to PR E2E tests

.github/workflows/pr-e2e-tests.yaml

@@ -14,7 +14,7 @@ jobs:
   e2e-tests:
     runs-on: ubuntu-latest
     strategy:
-      max-parallel: 1
+      max-parallel: 2
       matrix:
         python-version: ['3.8', '3.12']
         neo4j-version:
@@ -87,6 +87,11 @@ jobs:
       - name: Show disk usage after dependency installation
         run: |
           df -h
+      - name: Clear Poetry cache
+        run: poetry cache clear --all .
+      - name: Show disk usage after Poetry cache clear
+        run: |
+          df -h
       - name: Install root project
         run: poetry install --no-interaction
       - name: Install dependencies