Show or link to firewall rules on instance networking tab

Ben attempted to filter for relevant rules in https://github.com/oxidecomputer/console/pull/1890, but that is fraught given the impossibility of recreating networking logic on the client. I wonder if we could either list all the rules, or just link to the page from a very prominent box inside the networking tab. We do link to the VPC at the top but a) you might not realize that's where you need to go for firewall rules (we've talked about this), and b) it's not inside the networking tab you just clicked on.

Background: thinking about what it would look like to have a guided flow for debugging instance networking, and then backing out from that into what non-guided pages might show to enable a similar debugging process.

Review the networking tab and the existing VPC link, then read PR #1890 for the prior filtering attempt. Confirm with maintainers whether the tab should list firewall rules or provide a prominent link; done means the chosen debugging path is visible from the networking tab without recreating networking logic in the client.