Align UrlValidator to validate_url gem implementation.

What does this MR do?

Renamed UrlValidator to AddressableUrlValidator to avoid 'url:' naming collision with ActiveModel::Validations::UrlValidator in 'validates' statement.

Make use of the options attribute of the parent class ActiveModel::EachValidator.

Add more options: allow_nil, allow_blank.

Renamed 'protocols' option to 'schemes' to match the option naming from UrlValidator.

What are the relevant issue numbers?

Fixes #57365 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer