Revert^2 "Use RBE for run-test builds"

This makes the build of run-test data over 10x faster
(from >300 cpu-minutes to <30 cpu-minutes; wall-time)

The current CL lands the support in disabled state.

This reverts commit af5b17a532f9ea7d3f2a49fac98803de83ec7481.

Test: generated test data is bit for bit identical as before
Change-Id: Ic58eb9112d94cdc47990323886e1b0caf4b63dfb
1 file changed