[FR] Allow viewing meta bugs as bugzy features even if they don't block the bugzy epic

[aminomancer]

This will be a nice QoL feature. We show a limited number of high priority meta bugs in the sidebar, but there are many more metas not included there. We added a Metas view for them in #294, but the links still only go to Bugzilla. I want those links to lead to FeatureViews instead, since it doesn't cost us anything to allow querying and rendering them in Bugzy.

They still shouldn't show up the sidebar, but if you navigate to them via the Metas view, you'll stay within Bugzy rather than navigating to Bugzilla. Then you can navigate to the Bugzilla bug with the header link. Or make it so the bug number links in the Metas view lead to Bugzilla, but the summary links lead to Bugzy FeatureViews. That seems like the most elegant approach.