Upgrade/Install: Prevent some 5.5.0 upgrade routines from running twice.

This will prevent the options renamed for 5.5.0 from being converted twice. If a new update routine is added before 5.5 is released, the option values would be erased for anyone running `trunk` or nightlies without this change.

Props azaozz, desrosj, SergeyBiryukov, whyisjake.
Fixes #50413.
Built from https://develop.svn.wordpress.org/trunk@48400


git-svn-id: https://core.svn.wordpress.org/trunk@48169 1a063a9b-81f0-0310-95a4-ce76da25c4cd