Fix recent python linting errors

* Remove unneeded imports in 'fuscia-test-runner.py'
* Add explicit stacklevel to 'x.py'

Author: tgross35

src/ci/docker/scripts/fuchsia-test-runner.py

@@ -15,12 +15,10 @@
 import json
 import os
 import platform
-import re
 import shutil
-import signal
 import subprocess
 import sys
-from typing import ClassVar, List, Optional
+from typing import ClassVar, List
 
 
 @dataclass
@@ -523,7 +521,7 @@ def log(msg):
                     env_vars += '\n            "RUST_BACKTRACE=0",'
 
                 # Use /tmp as the test temporary directory
-                env_vars += f'\n            "RUST_TEST_TMPDIR=/tmp",'
+                env_vars += '\n            "RUST_TEST_TMPDIR=/tmp",'
 
                 cml.write(
                     self.CML_TEMPLATE.format(env_vars=env_vars, exe_name=exe_name)

x.py

@@ -40,7 +40,7 @@
 
             This message can be suppressed by setting `RUST_IGNORE_OLD_PYTHON=1`
         """.format(major, minor))
-        warnings.warn(msg)
+        warnings.warn(msg, stacklevel=1)
 
     rust_dir = os.path.dirname(os.path.abspath(__file__))
     # For the import below, have Python search in src/bootstrap first.