cpplint: add filter `whitespace/forcolon` (#29582)

whitespace/forcolon

.pre-commit-config.yaml

@@ -64,7 +64,7 @@ repos:
         - --linelength=240
         # https://google.github.io/styleguide/cppguide.html
         # relevant rules are whitelisted, see all options with: cpplint --filter=
-        - --filter=-build,-legal,-readability,-runtime,-whitespace,+build/forward_decl,+build/include_what_you_use,+build/deprecated,+whitespace/line_length,+whitespace/empty_if_body,+whitespace/empty_loop_body,+whitespace/empty_conditional_body,+whitespace/parens,+whitespace/semicolon,+readability/braces
+        - --filter=-build,-legal,-readability,-runtime,-whitespace,+build/forward_decl,+build/include_what_you_use,+build/deprecated,+whitespace/line_length,+whitespace/empty_if_body,+whitespace/empty_loop_body,+whitespace/empty_conditional_body,+whitespace/forcolon,+whitespace/parens,+whitespace/semicolon,+readability/braces
 -   repo: local
     hooks:
     -   id: test_translations