Backport of [ui] Sort variables ascending by key at serialization time into release/1.6.x #18052
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Backport
This PR is auto-generated from #18051 to be assessed for backporting due to the inclusion of the label backport/1.6.x.
The below text is copied from the body of the original PR.
Doesn't impact the variable view page, as it's already using a table that sorts ascending on key by default, but on the edit page, which iterates over and creates a form label for each, they'll now appear ascending on key alpha.