Improve extension plugins coverage

[cezaraugusto]

• HTML plugin tests
• Icons plugin tests
• Json plugin tests
• Locales plugin tests
• Manifest plugin tests
• Resolve plugin tests
• Scripts plugin tests
• Special Folders plugin tests
• Web Resources plugin tests
• Reload plugin tests
• Browser plugin tests

Future:

• Compatibility Plugin
• Js Frameworks Plugin
• Static Assets Plugin
• Css Plugin

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.99%. Comparing base (cc838c7) to head (9ccee92).

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   61.99%   61.99%           
=======================================
  Files          60       60           
  Lines        1055     1055           
  Branches      352      352           
=======================================
  Hits          654      654           
  Misses        398      398           
  Partials        3        3