Include read_global_vars.yml in pre-run: zuul.d/edpm_build_images.yam…

[amartyasinha]

…l & edpm_build_images_content_provider.yaml

The reason to make the change one file per commit is our flaky jobs. It is pain to get all jobs pass at once.

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[danpawlik]

normally, it looks fine, but difficult to say, due https://github.com/openstack-k8s-operators/ci-framework/blob/main/group_vars/all.yml is empty now.

[amartyasinha]

normally, it looks fine, but difficult to say, due https://github.com/openstack-k8s-operators/ci-framework/blob/main/group_vars/all.yml is empty now.

The reason it is empty is flaky jobs. Due to this, I've broken down the original PR #3237 into multiple small PRs to ensure gate jobs pass.