full drop usage of cirrus cache

.cirrus.yml

     namespace: default
     cpu: 1.7
     memory: 5Gb
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   env:
     # No need to clone the full history.
     # Depth of 1 is not enough because it would fail the build in case of consecutive pushes
     CIRRUS_CLONE_DEPTH: 50
   script:
     - ./private/cirrus/cirrus-build.sh
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-validate.sh postgres106
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
       QA_CATEGORY: Branch
       QA_CATEGORY: Upgrade
       QA_CATEGORY: HA
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-qa.sh postgres106
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
           MSSQL_PID: Developer # this is the default edition
           ACCEPT_EULA: Y
           SA_PASSWORD: sonarqube!1
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-db-unit-test.sh mssql2017
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-db-unit-test.sh postgres93
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
         memory: 5Gb
         env:
           ORACLE_PWD: sonarqube
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-db-unit-test.sh oracle12
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
     CIRRUS_CLONE_DEPTH: 50
     matrix:
       QA_CATEGORY: Upgrade
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-qa.sh mssql2017
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"
     CIRRUS_CLONE_DEPTH: 50
     matrix:
       QA_CATEGORY: Upgrade
-#  gradle_cache:
-#    folder: ~/.gradle/caches
   script:
     - ./private/cirrus/cirrus-qa.sh oracle12
-#  cleanup_before_cache_script:
-#    - ./private/cirrus/cleanup-gradle-cache.sh
   on_failure:
     reports_artifacts:
       path: "**/build/reports/**/*"