Support "zed://" to open Zed as External Editor
Summary:
See https://en.wikipedia.org/wiki/Zed_(text_editor) for more information.
This is a copy of trivial downstream https://github.com/mozilla-conduit/phabricator/commit/63bab05b7699ae517bbc1cf71c01022f142fbfa0 by Paul Adenot.
Closes T16153
Test Plan:
* Go to http://phorge.localhost/settings/panel/editor/, check the list under "Supported Editor Protocols".
* Optionally, install Zed and test this. (I did not. I assume that the Mozilla patch would have seen followup changes if this wouldn't work.)
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T16153
Differential Revision: https://we.phorge.it/D26142
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