chore: remove unused nightly workflow from CircleCI config (#169)

Author: NguyenHoangSon96

.circleci/config.yml

@@ -182,13 +182,9 @@ jobs:
             pip install pydocstyle --user
             pydocstyle --count influxdb_client_3
 
-
 workflows:
   version: 2
   build:
-    when:
-      not:
-        equal: [ scheduled_pipeline, << pipeline.trigger_source >> ]
     jobs:
       - check-code-style
       #      - check-docstyle
@@ -204,9 +200,3 @@ workflows:
           name: test-integration
           python-image: << pipeline.parameters.default-python-image >>
           pytest-marker: "integration"
-
-  nightly:
-    when:
-      equal: [ scheduled_pipeline, << pipeline.trigger_source >> ]
-    jobs:
-      - tests-python