Add missing id attribute to "Search Installed Themes" input.

Merges [26885] to the 3.8 branch.

props SergeyBiryukov.
fixes #26599.

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Pass the $user_id to the admin_color_scheme_picker hook for context.

Prevents the admin color scheme from changing when editing another user.

Merges [26924] to the 3.8 branch.
see #26607.

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Fix alignment and borders of plugin/theme updates on the Updates screen.

Merges [26935] to the 3.8 branch.

props morganestes, ocean90.
see #26699.

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Update versions in the 3.8 branch. see #26629.

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