update CRC pipeline to use main branch

Problem Description: After the master branch is renamed to main, the CRC pipeline configuration needs to be updated to reflect the new branch name

Proposed Solution: 

1. pr-checks: https://gitlab.cee.redhat.com/service/app-interface/-/blob/master/data/services/insights/automation-hub/cicd/ci-int/jobs.yml
2. builds: https://gitlab.cee.redhat.com/service/app-interface/-/blob/master/data/services/insights/automation-hub/cicd/ci-ext/jobs.yml
3. deploy: https://gitlab.cee.redhat.com/service/app-interface/-/blob/master/data/services/insights/automation-hub/deploy-clowder.yml