Issue
Jenkinsfiles inject hidden params via infraUtils.newStringJobParam (e.g., Velero/OADP versions, HCO image tag). This spreads ad-hoc context propagation across jobs.

Steps to reproduce
1. Review tier1/velero Jenkinsfile stage 'Add versions to hidden params'.
2. Review verify-cnv-build Jenkinsfile stage 'Adding HCO Tag'.

Expected result
Job context is set via a shared, structured API or context artifact.

Actual result
Multiple Jenkinsfiles set hidden params via newStringJobParam without a shared model.

Plan

• Add a shared helper (or context API) to set job execution metadata.
• For each Jenkinsfile, set context fields once (e.g., versions, tags).
• Remove direct newStringJobParam calls and document the standard usage.