[Merge] ~nteodosio/update-manager:mantic-ua into update-manager:main

[Nathan Teodosio]

The proposal to merge ~nteodosio/update-manager:mantic-ua into update-manager:main has been updated.

Description changed to:

Although Ubuntu Pro has no effect in development releases, the SRU policy[2] dictates that

> the development release is fixed before fixes are backported to the stable releases

Thus this "forwardport" of the Ubuntu Pro new design in Update Manager. E.g. as in Jammy[1]. 

[1] https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/450056
[2] https://wiki.ubuntu.com/StableReleaseUpdates#Development_Release_Fixed_First

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/451990
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