Fixes #51645

* add Enabled/Disabled extensions list view

* extract viewOrder calculation logic

and return Number.MAX_VALUE instead of Number.POSITIVE_INFINITY for
views end up with undefined order, when comparing two views like this,
we get Number.MAX_VALUE - Number.MAX_VALUE = 0, rather than NaN
caused by infinity arithmetic.

* allow Installed Extensions view to be toggled off

* refine query for enabled/disabled extensions

* simplify query for enabled/disabled extensions

* disabled extensions also include built-in ones

* Language pack descriptions are the local language name

* Clean up

* Simplify.

* Dont break the build.

* Don't close extensions on navigating to different activity view.
Add a config option to restore previous behaviour.

* Naming

* Naming #2

* Update wording.

* Use the `reasonText` atriburte of the extension reccomendation in label

* Lower case extension id before lookup

This change goes away with the terminal launch delay (since the
dynamic xterm import does that) as well as waiting for the panel
to display. By doing so, this ensures that the TerminalInstance
is available when it's needed for the TerminalPanel to focus it
when clicking on the panel button.

Fixes #40416

Revert "Add emoji fonts to default font families"

This reverts commit 88e75359.