Refactor CI/CD pipeline to include workflow rules and retain only deploy jobs

See merge request rc/packer-openstack-hpc-image!101

- Removed all jobs except for deploy_ood_proxy_node and deploy_ssh_proxy_node
- Added workflow rules to trigger pipeline based on source (web, schedule, manual)
- Updated scripts and environment variables for the remaining jobs

Fix centos yum repo

See merge request rc/packer-openstack-hpc-image!89

Add timestamps in user date

See merge request rc/packer-openstack-hpc-image!88

Fix integration project separation

Closes #116

See merge request rc/packer-openstack-hpc-image!87

Since the job only run in schedule pipeline after !74 merged

Fix race condition

Closes #99

See merge request rc/packer-openstack-hpc-image!85

Fix(cleanup_knightly): Remove unnecessary backslash

See merge request rc/packer-openstack-hpc-image!86

fix: keep last running instance

Closes #115

See merge request rc/packer-openstack-hpc-image!84