Process: remove unused code.

lisa/util/process.py

@@ -3,7 +3,7 @@ import pathlib
 import shlex
 import time
 from dataclasses import dataclass
-from typing import TYPE_CHECKING, Dict, Optional, Type
+from typing import Dict, Optional
 
 from spur.errors import NoSuchCommandError  # type: ignore
 
@@ -11,11 +11,6 @@ from lisa.util.logger import Logger, LogWriter, get_logger
 from lisa.util.perf_timer import create_timer
 from lisa.util.shell import Shell
 
-if TYPE_CHECKING:
-    BaseExceptionType = Type[BaseException]
-else:
-    BaseExceptionType = bool
-
 
 @dataclass
 class ExecutableResult: