infra: Enable remote linking for ci/Linux Builder

This enables remote linking for ci/Linux Builder, and switches it to
use the Siso's builtin RBE client.
This may help resolve the infra failure happening on the builder.

Test:
❯ led get-builder "chromium/ci/Linux Builder" | led edit-gerrit-cl https://chromium-review.googlesource.com/c/chromium/src/+/6048082 | led launch
https://ci.chromium.org/b/8730295154241424065

Bug: 380748579
Change-Id: I912492b2b5ab5c95083cfa078c2ad3e91e201881
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6048082
Reviewed-by: Struan Shrimpton <sshrimp@google.com>
Commit-Queue: Struan Shrimpton <sshrimp@google.com>
Auto-Submit: Junji Watanabe <jwata@google.com>
Cr-Commit-Position: refs/heads/main@{#1387688}