Errors from new parser can be worse (compared to old parser)

[ilevkivskyi]

This is a follow-up for #21823. Most notably something like this causes two errors with different error codes:

x = 0  # type: x y  # E: Syntax error in type comment "x y"  [syntax] \
                    # E: Invalid type comment or annotation  [valid-type]

Potentially we may want to add some filtering logic to improve/simplify syntax errors.
cc @JukkaL