Disable zucchini for all OTAs

zucchini failure in OTA is observed. To unblock, disable
zucchini first. After the investigation are done and determined
zucchini is safe to enable, we will turn it back on.

Test: th
Bug: 342523982
(cherry picked from https://android-review.googlesource.com/q/commit:d4bdbdced6a1e48f90c2c2358532f81d93de5a90)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a4d16eb6b36fbe77234a6e4e7259209ce5cfb254)
Merged-In: I79c245356a356389328c788b3b7977b224e1df6a
Change-Id: I79c245356a356389328c788b3b7977b224e1df6a