[bazel][tools] Removing unused clean_repo.py

This removes the clean_repo.py tool. It is not referenced in the
build rules and is somewhat obsolete due to migrating the package
server functionality to the standalone repo server.

Bug: 376678251

Change-Id: Iab4d6a0bcd78ab96edb54ebb4f2a9fca9983f7a7
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1152854
Commit-Queue: Clayton Wilkinson <[email protected]>
Reviewed-by: Jiaming Li <[email protected]>

Author: claywilkinson

build/bazel_sdk/bazel_rules_fuchsia/fuchsia/tools/BUILD.bazel

@@ -131,15 +131,6 @@ py_binary(
     deps = [":fuchsia_task_lib"],
 )
 
-py_binary(
-    name = "clean_repo",
-    srcs = ["clean_repo.py"],
-    python_version = "PY3",
-    deps = [
-        ":fuchsia_task_lib",
-    ],
-)
-
 py_binary(
     name = "development_status",
     srcs = ["development_status.py"],