[CodeStyle] add pre-commit hook `remove-tabs` for python files (#46290)

.flake8

 [flake8]
 select = C,E,F,W
-exclude = ./build
+exclude =
+    ./build,
+    # A trick to exclude fluid/ but keep fluid/tests/, see more at
+    # https://github.com/PaddlePaddle/Paddle/pull/46290#discussion_r976392010
+    ./python/paddle/fluid/[!t]**,
+    ./python/paddle/fluid/tra**
 ignore =
     # E, see https://pycodestyle.pycqa.org/en/latest/intro.html#error-codes
-    E101,E121,E122,E123,E124,E125,E126,E127,E128,E129,E131,
-    E201,E202,E203,E221,E225,E226,E228,E231,E241,E251,E261,E262,E265,E266,E271,E272,E275,
+    E121,E122,E123,E125,E126,E127,E128,E129,E131,
+    E201,E202,E203,E225,E226,E228,E231,E241,E251,E261,E262,E265,E266,E271,E272,
     E301,E302,E303,E305,E306,
     E401,E402,
     E501,E502,
     E701,E711,E712,E713,E714,E721,E722,E731,E741,
 
     # F, see https://flake8.pycqa.org/en/latest/user/error-codes.html
-    F401,F402,F403,F404,F405,
-    F522,F523,F524,F541,
+    F401,F402,F403,F405,
+    F522,F524,F541,
     F601,F631,F632,
-    F811,F821,F823,F841,
+    F811,F821,F841,
 
     # W, see https://pycodestyle.pycqa.org/en/latest/intro.html#error-codes
-    W191,
     W503,W504
     W601,W605
+per-file-ignores =
+    # These files need tabs for testing.
+    python/paddle/fluid/tests/unittests/dygraph_to_static/test_error.py:E101,W191
+    python/paddle/fluid/tests/unittests/collective/fleet/test_hdfs1.py:E101,W191

.pre-commit-config.yaml

+# Exclude all third-party libraries globally
 exclude: |
     (?x)^(
         patches/.+|
         paddle/fluid/framework/fleet/heter_ps/cudf/.+|
-        paddle/fluid/distributed/ps/thirdparty/round_robin.h
+        paddle/fluid/distributed/ps/thirdparty/round_robin.h|
+        python/paddle/utils/gast/.+
     )$
 repos:
 -   repo: https://github.com/Lucas-C/pre-commit-hooks.git
@@ -12,6 +14,17 @@ repos:
     -   id: remove-tabs
         files: \.(c|cc|cxx|cpp|cu|h|hpp|hxx|xpu|kps)$
         args: [--whitespaces-count, '2']
+    -   id: remove-tabs
+        files: (.*\.(py|bzl)|BUILD|.*\.BUILD|WORKSPACE)$
+        args: [--whitespaces-count, '4']
+        # Exclude the fluid directory but keep the fluid/tests directory.
+        # And exclude some unit test files that require tabs.
+        exclude: |
+            (?x)^(
+                python/paddle/fluid/(?!tests).+|
+                python/paddle/fluid/tests/unittests/collective/fleet/test_hdfs1.py|
+                python/paddle/fluid/tests/unittests/dygraph_to_static/test_error.py
+            )$
 -   repo: https://github.com/google/yapf
     rev: v0.32.0
     hooks: