OCP Upgrade: Add missing openshift_build_name to upgrade job definitions

[dlaw4608]

Add openshift_build_name: "" to all upgrade job definitions to fix build resolution during the upgrade stage

Verified 4.21 → 4.22 upgrade completes successfully on RHOSO 18 with this field present

TASK [shiftstack.stages.upgrade : Display upgrade completion] ******************
ok: [localhost] => {
    "msg": "Successfully upgraded cluster from 4.21 to 4.22"
}

Next step is adding a job definiton for upgrade_4.21_to_4.22_osp18.yaml in ci-framework
Then E2E validation can be ran.

But this PR needs to be merged first

[ekuris-redhat]

/lgrm
/approve

[openshift-ci]

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[tusharjadhav3302]

we could add the comment "# It can be an empty value "" (latest nightly), a given build
" similar to other job defs for future readers. Not a blocker at all .