[semantic tokens] improve code completions for `editor.semanticTokenColorCustomizations`. Fixes #96351

Fixes #46696

fixes #96713

Fixes #96586

Ref #96672.

* Revert "Distinguish a user removing a row from 'clear' in search"

This reverts commit 4cf9c461.

* Revert "Fix searchResult tests"

This reverts commit 7646b358.

* Make search dirty on any removal, but ony if it does not leave the view empty.

Removes the workaround for maximizing the panel. Instead track if the editor is visible and only lay the view out if the editor is visible

Part of #97016

Fixes #95556

Part of https://github.com/microsoft/vscode/issues/96999

Use dropdown.background color in debug dropdown container