Internally enable flake8 checks: F723 and F821 (#9776)
Internally enable flake8 checks: F723 and F821 (#9776)

F723 - Unrecognized syntax in type comment
F821 - undefined name

[ci skip-rust-tests]
[ci skip-jvm-tests]
jsirois/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,jsirois/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,jsirois/pants,benjyw/pants,pantsbuild/pants