CI - Clean the Gradle temp directory

Hopefully, this will fix the errors we have when trying to upload
artifacts.

.github/workflows/ci-actions-incremental.yml

@@ -305,6 +305,9 @@ jobs:
         shell: bash
         # Despite the pre-calculated run_jvm flag, GIB has to be re-run here to figure out the exact submodules to build.
         run: ./mvnw $COMMON_MAVEN_ARGS install -Dsurefire.timeout=1200 -pl !integration-tests/gradle -pl !integration-tests/maven -pl !integration-tests/devtools ${{ matrix.java.maven_args }} ${{ needs.build-jdk11.outputs.gib_args }}
+      - name: Clean Gradle temp directory
+        shell: bash
+        run: devtools/gradle/gradlew --stop && rm -rf devtools/gradle/gradle-extension-plugin/build/tmp
       - name: Prepare failure archive (if maven failed)
         if: failure()
         shell: bash
@@ -327,7 +330,6 @@ jobs:
           retention-days: 2
       - name: Upload gc.log
         uses: actions/upload-artifact@v2
-        if: failure()
         with:
           name: "GC log - JDK ${{matrix.java.name}}"
           path: |