Improve console messages

The console messages do not include any prefix identifying them as being from the phishing warning page. This can be confusing when this page is loaded in an iframe, or in other shared-console contexts. We should add a prefix so that these messages are better understood.

Locate the console-message calls in the phishing warning page source and inspect how they are exercised, including any existing tests. Add a consistent identifier for this page to those messages, then verify that the prefix remains understandable when the page is embedded in an iframe or shares a console with other content.

Written by the indexing model from the issue text.