Revert "Disable uploading to GCS through buildkite-agent" (#1825)

This didn't help much with the postsubmits.

This reverts commit 7dfa409.

buildkite/bazelci.py

@@ -1493,7 +1493,7 @@ def activate_xcode(task_config):
     #  or the requested version is not installed.
     if xcode_version not in supported_versions:
         xcode_version = supported_versions[0]
-
+    
     if not wanted_xcode_version or wanted_xcode_version == xcode_version:
         print_collapsed_group(":xcode: Activating Xcode {}...".format(xcode_version))
     else:
@@ -1603,9 +1603,6 @@ def upload_bazel_binary(platform):
         binary_dir = "bazel-bin/src"
         binary_name = "bazel"
         binary_nojdk_name = "bazel_nojdk"
-    if is_lab_machine():
-        eprint("Uploading to GCS through buildkite-agent is currently not supported on lab machines.")
-        return
     execute_command(["buildkite-agent", "artifact", "upload", binary_name], cwd=binary_dir)
     execute_command(["buildkite-agent", "artifact", "upload", binary_nojdk_name], cwd=binary_dir)
 
@@ -2601,9 +2598,6 @@ def upload_json_profile(json_profile_path, tmpdir):
     if not os.path.exists(json_profile_path):
         return
     print_collapsed_group(":gcloud: Uploading JSON Profile")
-    if is_lab_machine():
-        eprint("Uploading to GCS through buildkite-agent is currently not supported on lab machines.")
-        return
     execute_command(["buildkite-agent", "artifact", "upload", json_profile_path], cwd=tmpdir)
 
 
@@ -2613,9 +2607,6 @@ def upload_corrupted_outputs(capture_corrupted_outputs_dir, tmpdir):
     if not os.path.exists(capture_corrupted_outputs_dir):
         return
     print_collapsed_group(":gcloud: Uploading corrupted outputs")
-    if is_lab_machine():
-        eprint("Uploading to GCS through buildkite-agent is currently not supported on lab machines.")
-        return
     execute_command(
         ["buildkite-agent", "artifact", "upload", "{}/**/*".format(capture_corrupted_outputs_dir)],
         cwd=tmpdir,