Improve error passing task IDs as URL parameter in invalid format
Summary:
Maniphest expects the values of the `ids` URL parameter to be integers. Example: http://phorge.localhost/maniphest/?ids=1,2,3,4 to show a list of tasks with those IDs.
When passing monograms instead (`T` prefix, like `T123` instead of `123`), a cryptic message `Expected a numeric scalar or null for %Ld conversion` is shown.
Thus check if `$this->taskIDs` consists of integers only; if not throw a `PhutilSearchQueryCompilerSyntaxException` with an explanatory error message.
Closes T15838
Test Plan: Go to http://phorge.localhost/maniphest/?ids=T1,T2,T3,T4 before and after applying the patch.
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15838
Differential Revision: https://we.phorge.it/D25669