Improve incorrectly flagged reporting flow

Now that our phishing warning page receives reports from multiple sources, we should ensure that users or site owners reporting a false positive can do it helpful.

One idea is to have pre-filled issues. I'm making an example here.

`https://github.com/MetaMask/phishing-warning/issues/new?body=domain:[$bad_flagged_url], source: [$name_of_the_list]`

We should provide all this information without affecting users' privacy while allowing them to open tickets in an open repo for human review.

This issue must be opened when the user clicks/tap the link [please report a detection problem].

Start at the phishing warning page entry point and locate the “please report a detection problem” link. Define done as providing a privacy-preserving report flow that includes the flagged domain and source when opening a review ticket, without exposing unnecessary user information.

Written by the indexing model from the issue text.