Revert "Roll per-builder build-dir experiment to all (try.)chromium.mac bots"

This reverts commit 87019ed1cda676034f4f75f6d61775f4dfb13cae.

Reason for revert: may have broken some telemetry unit tests
eg: https://ci.chromium.org/ui/p/chromium/builders/ci/mac11-arm64-rel-tests/47482/overview

Original change's description:
> Roll per-builder build-dir experiment to all (try.)chromium.mac bots
>
> The experiment's been on the entire CQ for a while now. This starts
> rolling it to more bots.
>
> Bug: 355218109
> Change-Id: Ib186baea063afff74c0a5ccc84ac216fc5699318
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5950545
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Yue She <yueshe@google.com>
> Cr-Commit-Position: refs/heads/main@{#1371670}

Bug: 355218109
Change-Id: Id1ffb691f10852f04905511b7fb8618b31e3ff60
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5951075
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1371795}