zuul: Add docs to irrelevant-files for CI jobs

[rabi]

Skip jobs when only documentation files are changed.

Jobs updated:

• openstack-operator-kuttl
• openstack-operator-tempest-multinode
• podified-multinode-edpm-deployment-crc
• cifmw-crc-podified-edpm-baremetal
• adoption-standalone-to-crc-ceph-provider

[openshift-ci]

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[softwarefactory-project-zuul]

Zuul encountered a syntax error while parsing its
configuration in the repo openstack-k8s-operators/openstack-operator on branch main. The
problem was:

expected str for dictionary value @ data['github-check']['jobs'][0]['openstack-k8s-operators-content-provider']

The problem appears in the the "openstack-k8s-operators/openstack-operator" project stanza:

project:
name: openstack-k8s-operators/openstack-operator
github-check:
jobs:
- openstack-k8s-operators-content-provider:
- podified-multinode-edpm-deployment-crc:
irrelevant-files: &irrelevant-files
- ./.md
- ^..*$
...

in "openstack-k8s-operators/openstack-operator/zuul.d/projects.yaml@main", line 2