run_tests: integrate pylint

Since we run this during `repo upload`, integrate it into CI too.

And then fix the latest pylint errors that have slipped in.

Bug: None
Test: `./run_tests`
Change-Id: I114f831b272b02424396fccf49878fd55446768d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repohooks/+/556726
Reviewed-by: Raul Rangel <rrangel@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>

run_tests

diff --git a/run_tests b/run_tests
index 348f8ec..742a222 100755
--- a/run_tests
+++ b/run_tests
@@ -76,11 +76,38 @@
     ).returncode
 
 
+def run_pylint() -> int:
+    """Returns the exit code from pylint."""
+    argv = ["--version"]
+    log_cmd("pylint", argv)
+    subprocess.run(
+        [sys.executable, "-m", "pylint"] + argv,
+        check=True,
+        cwd=ROOT_DIR,
+    )
+
+    argv = [
+        "--rc-file=tools/pylintrc",
+        "pre-upload.py",
+        "run_tests",
+        "rh/*.py",
+        "tools/*.py",
+        "tools/cpplint.py-update",
+    ]
+    log_cmd("pylint", argv)
+    return subprocess.run(
+        [sys.executable, "-m", "pylint"] + argv,
+        check=False,
+        cwd=ROOT_DIR,
+    ).returncode
+
+
 def main(argv):
     """The main entry."""
     checks = (
         functools.partial(run_pytest, argv),
         run_black,
+        run_pylint,
     )
     # Run all the tests all the time to get full feedback.  Don't exit on the
     # first error as that makes it more difficult to iterate in the CQ.

run_tests.vpython3

diff --git a/run_tests.vpython3 b/run_tests.vpython3
index 878e36a..dd3f4df 100644
--- a/run_tests.vpython3
+++ b/run_tests.vpython3
@@ -99,3 +99,32 @@
   name: "infra/python/wheels/isort-py3"
   version: "version:5.10.1"
 >
+
+wheel: <
+  name: "infra/python/wheels/pylint-py3"
+  version: "version:3.2.7"
+>
+
+# Required by pylint==3.2.7
+wheel: <
+  name: "infra/python/wheels/astroid-py3"
+  version: "version:3.2.4"
+>
+
+# Required by pylint==3.2.7
+wheel: <
+  name: "infra/python/wheels/mccabe-py3"
+  version: "version:0.6.1"
+>
+
+# Required by pylint==3.2.7
+wheel: <
+  name: "infra/python/wheels/tomlkit-py3"
+  version: "version:0.12.3"
+>
+
+# Required by pylint==3.2.7
+wheel: <
+  name: "infra/python/wheels/dill-py3"
+  version: "version:0.3.7"
+>