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These testers are triggered by "Android arm Builder (dbg)".
Unfortunately, these testers all have very limited capacity, e.g.
only 3 hosts for "KitKat Tablet Tester" (http://shortn/_FgzmFPwSjC).
In addition, it is not strictly necessary to run these testers
on the branches, as they are not run as part of Branch CQ; only
the compiler is mirrored onto CQ as "android_compile_dbg".

This CL removes these testers from the branched CI configuration.
In order to ensure that they continue to be appropriately triggered
on master, it adds a munger which ensures their scheduler tasks
have the appropriate names. In order to ensure that their absence
doesn't break the branch builders, it adds a generator which creates
no-op jobs with the appropriate names.

Bug: 1049150
Change-Id: Ie87bfc88580811e357feaaea0aeda9412e001f63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076703Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745242}