Merge branch 'remove-gitlab-ci-file' into 'main'

SKIP UPDATE CHECK Delete .gitlab-ci.yml

See merge request platform-one/big-bang/apps/developer-tools/gitlab-runner!37

.gitlab-ci.yml

-include:
-  - project: 'platform-one/big-bang/pipeline-templates/pipeline-templates'
-    ref: 'master'
-    file: '/templates/package-tests.yml'
-
-variables:
-  PACKAGE_NAMESPACE: 'gitlab'
\ No newline at end of file