Add a Copy button to OAuth Server Application Secret dialog
Summary:
Allow clicking once to copy an OAuth Server Application Secret to be used in some external application anyway, instead of having to click into the text field and copy its value.
Also make clicking into the text field select its value.
Also convert this from an AphrontFormTextAreaControl to an AphrontFormTextControl as this is a single line, and use the standard dialog width, for the sake of consistency.
Closes T16519
Test Plan:
1. `./bin/config set phabricator.show-prototypes true`
2. Install/enable http://phorge.localhost/applications/view/PhabricatorOAuthServerApplication/
3. Go to http://phorge.localhost/oauthserver/ and create an Auth Server
4. Go to http://phorge.localhost/oauthserver/client/view/1
5. Select "Show Application Secret"
6. Click "Show Application Secret"
7. See a Copy button next to the "Token" text field; hover over it, click it, paste, etc
8. Click into the "Token" text field, see that the value gets selected
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T16519
Differential Revision: https://we.phorge.it/D26790