Upgrade/Install: Enhance auto-updates to be disabled for plugins that don't suport updates.

This removes the toggle UI when updates aren't available. When plugins use the filter, the UI is updated to show that they are being controlled via code. And then removed entirely when not available.

See #50798.
Fixes #50280.

Props elrae, pbiron, SergeyBiryukov, audrasjb, azaozz, StephenCronin, whyisjake, dd32, TimothyBlynJacobs, desrosj.


Built from https://develop.svn.wordpress.org/trunk@48669


git-svn-id: https://core.svn.wordpress.org/trunk@48431 1a063a9b-81f0-0310-95a4-ce76da25c4cd