rh_metadata: support fix_versions as a list

Patrick Talbertrequested to merge
ptalbert/kernel-workflow:fix_versions_as_a_list into main

During early zstream stage a Branch should be able to behave as a ystream or a zstream. With BZs we achieved this by defining Branches with both an ITR and a ZTR. For Jira we need to be able to specify a Branch with multiple fixVersions.

This renames the new Branch 'fix_version' attribute to 'fix_versions' and changes it from a string to a list.

Signed-off-by: Patrick Talbert ptalbert@redhat.com

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