R1:8a5def8e0ae1

Remove legacy transaction editor "getDisableEmail()" method

Summary:
Ref T13042. This is a very, very old policy-violating option from yesteryear which supported build systems publishing updates by adding comments to revisions, without sending email about it.

Harbormaster has served this role for a long time and this is policy-violating in the general case (it allows attackers to act in secret).

Test Plan: Grepped for affected symbols.

Reviewers: amckinley

Reviewed By: amckinley

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