Looks like Microsoft is finally working on “Portable Mode” for Windows Terminal

Having a portable version of terminal makes it easy to copy paste on machines some times on servers. Having to install from store is not convenient.

This pull request implements portable mode for Windows Terminal, which
will make side by side deployment of different versions generally more
feasible.

Portable mode was specified in #15032.

There are three broad categories of changes in this PR:

1. Changes to settings loading.
2. A new indicator in the settings UI plus a link to the portable mode docs.
3. A new application display name, Windows Terminal (Portable), which users will hopefully include in their bug reports.

A new documentation page for Windows Terminal Portable mode is already present on Microsoft’s website, though at the moment it does not contain any information as the feature is not publicly available yet.

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