Revert "Telemetry: disable for non-linux"

This reverts commit dcbf502f02.

Reason for revert: Fixes have landed

Bug: 326277821
Original change's description:
> Telemetry: disable for non-linux
>
> Something about collecting traces before explicit opt-in is causing
> the output on win to get consumed. Disable for non-linux until I can
> more thoroughly test and figure out what's going on
>
> Bug: 326277821
> Change-Id: I8536cb61078ef98e37c5ab3e1c8abe2141a50eef
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6648247
> Auto-Submit: Struan Shrimpton <sshrimp@google.com>
> Commit-Queue: Struan Shrimpton <sshrimp@google.com>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>

Bug: 326277821
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I0d122895a832130fef5eebaf4cd4b5896dba4806
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6648626
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Struan Shrimpton <sshrimp@google.com>

infra_lib/telemetry/__init__.py

@@ -66,9 +66,6 @@ def is_google_host() -> bool:
 def initialize(service_name,
                notice=DEFAULT_BANNER,
                cfg_file=config.DEFAULT_CONFIG_FILE):
-    # TODO(326277821): Renable after more thorough testing
-    if not sys.platform.startswith('linux'):
-        return
 
     cfg = config.Config(cfg_file)
     if cfg.trace_config.disabled():