package_mr: add upgrade notices field
General MR
Summary
Adds the Upgrade Notices section to the package MR template as well.
Required as part of: bigbang#1694 (closed), bigbang#1696 (closed), bigbang#1697 (closed)
UNCLASSIFIED - NO CUI
Currently supported Big Bang Version is 2.29
Adds the Upgrade Notices section to the package MR template as well.
Required as part of: bigbang#1694 (closed), bigbang#1696 (closed), bigbang#1697 (closed)
UNCLASSIFIED - NO CUI