tools: fixed check-imports.py to ignore commented lines

The script check-imports.py will now ignore the usage of module names in
commented lines. Additionally, while searching for the usage,
word boundaries will be used. Eg: 'Just' would not be considered in a
sentence containing 'FromJust'.

Fixes: nodejs#29226

tools/check-imports.py

@@ -5,10 +5,13 @@
 import re
 import sys
 
+def check_negative_cases(line, imported):
+  return re.match('using \w+::{0};'.format(imported), line) or re.match('^(\/\/)', line)
+
 
 def do_exist(file_name, lines, imported):
-  if not any(not re.match('using \w+::{0};'.format(imported), line) and
-             re.search(imported, line) for line in lines):
+  if not any(not check_negative_cases(line, imported) and
+             re.search('(\b{0}\b)'.format(imported), line) for line in lines):
     print('File "{0}" does not use "{1}"'.format(file_name, imported))
     return False
   return True