Add BUILD_BROKEN_PLUGIN_VALIDATION flag

Use is to specify the list of plugins are are not allowed.

Ignore-AOSP-First: Requires an internal only change to not break when submitted
Test: CI
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f24be9dba9b53b0c1682929253a3eba9af7a4c31)
Merged-In: Ia2fe83d82ead618e480e99a82b1b825ed08d3eab
Change-Id: Ia2fe83d82ead618e480e99a82b1b825ed08d3eab