Disable RBE in multiproduct_kati

RBE has signifigant performance overhead during
analysis time, in theory to reduce execution time.
But multiproduct_kati only tests analysis, and does
not run any execution, so RBE is just slowing us
down.

Bug: 229863781
Bug: 265603584
Test: time ./build/soong/build_test.bash  --products aosp_arm64 on stage_aosp_master
Change-Id: Icbb2f001fee03a75bad37c14d08a203be20ac6cf