Extensions should not a consumer of its own hooks,
just call the code before calling the hook.
In case of EchoGetBundleRules each extension should only handle it's
own event, so this is not a breaking change.
In case if EchoAbortEmailNotification the return false in the hook
handler already aborted further hooks, so this is not a breaking change.
Change-Id: I2715aa6499d01a1c1b3a27ff510b331eae0deca9
Most notably, CatchableFatalErrorException and the code that throws it
are unused since Ic5712c4ce265b6faabce7a4028b4294fe3c73f18 (in 2016).
Bug: T328220
Change-Id: I5497347e41b21d2623b7e79bf7f977268a809c1d
