Unhandled Exception: Add last call to error message
Summary:
Phorge does not expose the location of the last call in unhandled exceptions on the web page. One has to open the error log or console to find the location.
The error message in the yellow box comes directly from PHP's `$throwable->getMessage()`, and the stacktrace comes directly from PHP's `$throwable->getTrace()`.
Thus manually concatenate the error message string with `$throwable->getFile()` and `$throwable->getLine()` to display the location of the last call but strip the absolute path not to expose server details.
Closes T15689
Test Plan:
Introduce a random PHP error and load the Phorge page.
For example, add `$chart_view += $chart_panel;` in src/applications/project/controller/PhabricatorProjectReportsController.php and go to http://phorge.localhost/project/reports/1/
Reviewers: O1 Blessed Committers, mainframe98, valerio.bozzolan
Reviewed By: O1 Blessed Committers, mainframe98, valerio.bozzolan
Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15689
Differential Revision: https://we.phorge.it/D25955