Impliment CCI approval w/f for automated test cases

[sushilshinde]

Implement https://circleci.com/docs/2.0/workflows/#holding-a-workflow-for-a-manual-approval for automated test cases

(https://circleci.com/blog/manual-job-approval-and-scheduled-workflow-runs)

References repo:
https://github.com/topcoder-platform/tc-project-service/blob/develop/.circleci/config.yml

[luizrrodrigues]

@sushilshinde Implemented manual approval to ci-manual-approval branch.
https://app.circleci.com/pipelines/github/topcoder-platform/community-app/2419/workflows/358eec5e-fdc6-4606-beeb-a38d62c77a6e

Please take a look and let me know if this working as expected. (note: Currently after approve workflow will deploy to Stag just for testing)

[SathyaJayabal]

verified approval flow for smoke test build on staging

[SathyaJayabal]

@luizrrodrigues , lets close this one after configuration done for build-prod

[SathyaJayabal]

Approval workflow implemented for prod