Enhance script to detect missing testrail urls

[isabelrios]

There is this situation in which a test has a comment and above it the url, in that case the url is missed.

testValidatePopUpWindows: https://github.com/mozilla-mobile/firefox-ios/blob/ea7b0271e0bf4cbed989374417909d5[…]efox-ios/firefox-ios-tests/Tests/XCUITests/NavigationTest.swift

cc @dragosb01

[isabelrios]

Also Skip check in ScreengraphTest file since this is about kind of unit testing the screen graph. And, SiteLoadTest.swift

[isabelrios]

#232

[isabelrios]

Previous cases covered in PR #232 . There are new cases to cover though:

• testLandscapeNavigationWithTabSwitch, there is a /** */ kind of a comment
• testImageOff: has three comment:
  // https://mozilla.testrail.io/index.php?/cases/view/2307058
  // Functionality is tested by UITests/NoImageModeTests, here only the UI is updated properly
  // SmokeTest TAE
• we should also remove: firefox-ios/firefox-ios-tests/Tests/XCUITests/NoImageTests.swift

[isabelrios]

Those cases should be covered in #235