Add error handling to "New note from URL" dialog

[AWolf81]

Description

Adds error handling for "New note from URL" dialog.

Issue fixed

Fixes #3308

• Display error message on url not found
• Keep "New note" functional

Type of changes

• 🔘 Bug fix (Change that fixed an issue)
• ⚪ Breaking change (Change that can cause existing functionality to change)
• ⚪ Improvement (Change that improves the code. Maybe performance or development improvement)
• ⚪ Feature (Change that adds new functionality)
• ⚪ Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• 🔘 All existing tests have been passed
• 🔘 I have attached a screenshot/video to visualize my change if possible

Screenshots

URL not found

Wrong url format - missing .com

Comments

• Is it OK to add the messages as a constant into the file? Or is there a constants file where we could add it?
• Unexpected error message is just a fallback if the code is not matching and I think that's OK.
• Are the error messages OK? I've added the check your internet connection because you're also getting ENOTFOUND with-out internet connection.

[ZeroX-DG]

LGTM 🎉 You probably won't re-use these message in the future so I think putting them here is good enough:)