[Build] Disable building the _Distributed library by default.

Author: hborla

utils/build_swift/build_swift/driver_arguments.py

@@ -1188,7 +1188,7 @@ def create_argument_parser():
            help='Enable experimental Swift concurrency model.')
 
     option('--enable-experimental-distributed', toggle_true,
-           default=True,
+           default=False,
            help='Enable experimental Swift distributed actors.')
 
     option('--enable-experimental-string-processing', toggle_true,

utils/build_swift/tests/expected_options.py

@@ -144,7 +144,7 @@
     'enable_asan': False,
     'enable_experimental_differentiable_programming': True,
     'enable_experimental_concurrency': True,
-    'enable_experimental_distributed': True,
+    'enable_experimental_distributed': False,
     'enable_experimental_string_processing': True,
     'enable_lsan': False,
     'enable_sanitize_coverage': False,