[buildkite] Pause coverage reporting in buildkite pipeline tests (#4314)

* pause code coverage in makefile for unit test, big unit test, integration

* set SKIP_CODECOV variable to true

* try setting SKIP_CODECOV directly above the if check

* export SKIP_CODECOV

* only export SKIP_CODECOV once

* brute force, delete the lines that are uploading coverage

* add env to just integration dbnode recently read test in pipeline

* revert

* add extra line

* add SKIP_CODECOV=true into doc-docker-compose.yml

* add SKIP_CODECOV to docker-compose for docker container app only

docker-compose.yml

@@ -38,3 +38,4 @@ services:
       - SPLIT_IDX
       - TOTAL_SPLITS
       - GOPATH=/go
+      - SKIP_CODECOV=true