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(stable) Provide a more tailored error message when a Herald rule fails because…

Description

(stable) Provide a more tailored error message when a Herald rule fails because of PCRE limits

Summary: Ref T13100. Since rules may begin failing for PRCE configuration reasons soon, provide a more complete explanation of possible causes in the UI.

Test Plan: Faked this, hit it via test console, saw explanation in web UI.

Maniphest Tasks: T13100

Differential Revision: https://secure.phabricator.com/D19178