Use key-value structure in Release Environment MR label script

Jason Rogena (GitLab)requested to merge
jrogena/structured-logging-re-update-mr-label into master

What does this MR do and why?

This MR updates the logged data in the update_merge_requests_label script to use key-values to make the logging more structured.

Ref gitlab-com/gl-infra/delivery#21529 (closed)

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