AMW-495 Move runners from hosted to self-hosted env

[RanabirChakraborty]

Issue: https://redhat.atlassian.net/browse/AMW-495

[RanabirChakraborty]

@hcherukuri @iweiss We're migrating from GitHub-hosted runners to self-hosted runners to reduce GitHub Actions costs. Following the official GitHub documentation: https://docs.github.com/en/actions/how-tos/manage-runners/self-hosted-runners/use-in-a-workflow, we're using runs-on: self-hosted instead of hardcoding specific runner labels like ubuntu-latest, which allows GitHub Actions to automatically select any available self-hosted runner for jobs that don't require specific configurations. We've kept specific labels like molecule-2.18, molecule-2.19, molecule-2.20 for jobs that require particular Ansible/molecule versions.

Please review

[hcherukuri]

I want to test out this changes, the github actions on keycloak are failing after the recent changes.

[iweiss]

It would be good to test these before merging. Any suggestions how to do it?