[infra] Enable siso_enable_cloud_{profiler, trace} flags in lib/builders.star by default

This CL moves the following defaults to infra/config/lib/builders.star.
    siso_configs = ["builder"]
    siso_enable_cloud_profiler = True
    siso_enable_cloud_trace = True

This CL also fixes `ci/chromium.linux.star` missing siso_configs=['builder'].

Change-Id: Ibc4ee1ace33ed360768baf8ac872e08752c10e81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5456554
Commit-Queue: Junji Watanabe <jwata@google.com>
Reviewed-by: Gary Tong <gatong@chromium.org>
Auto-Submit: Junji Watanabe <jwata@google.com>
Cr-Commit-Position: refs/heads/main@{#1288455}