bazel: skip building symlink forest for runfiles, i.e. set --nobuild_runfile_links

[ParkMyCar]

Sets --nobuild_runfile_links for our build which skips building the symlink forest for Bazel's "runfiles", unless it's required.

This is a small change but it reduces the amount of I/O Bazel needs to do. I've been dogfooding it locally for months and haven't run into any issues so it should be good to go. The reason this isn't the default in Bazel is because some legacy rules rely on the old behavior.

Motivation

Less I/O in the Bazel build

Checklist

• This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.