siso: Run Android proguard actions remotely

Each proguard action takes about 4GB of memory, which runs at
the last link phase. This sometimes makes bot builds fail for OOM or
slow.
This CL offloads proguard actions to RBE workers.

Bug: 355704916
Change-Id: Ia63bd5884817c91dd186ab36d8d3cdd4bc3378a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5872370
Auto-Submit: Junji Watanabe <jwata@google.com>
Commit-Queue: Junji Watanabe <jwata@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Philipp Wollermann <philwo@google.com>
Cr-Commit-Position: refs/heads/main@{#1358021}