[feature] Allow ignore_status_code to be a global option

**Version and OS**
Docker 0.45.21

**Is your feature request related to a problem? Please describe.**
A feature request to have Ignore Status Code be one of the following:

A global setting
A tag when importing a large number of URLS

**Describe the solution you'd like**
I am importing ~100 URLs that are not currently live. I would like to receive a notification when the site goes live.

No notification is sent unless the option 'ignore_status_code = true'

This means manually editing 100 connections

**Describe the use-case and give concrete real-world examples**
Import a URL that cannot be resolved and receive the following error: "Failed to establish a new connection: [Errno -2] Name or service not known"

Have the URL go live and add an image.

No notification is sent

**Additional context**
Add any other context or screenshots about the feature request here.

Start by tracing where the ignore_status_code option is read and where imported URLs are configured. Compare the requested global setting with the tag-based import option, then verify that unresolved URLs can later trigger notifications and image changes without editing each connection.

Written by the indexing model from the issue text.