Add read-only UI for internet gateways

[charliepark]

Closes #2402

The intent is — at the moment — to create a read-only view of the Internet Gateways, and to then iterate on it in future releases, adding create/update/delete functionality.

We're still pulling a bit of this together, but it's close, and as Omicron just got updated to include internet gateways, I figured it would be good to start a PR so we can talk through a few of the specific choices and what we might want to do differently.

I think our demo Internet Gateways / IG IP Pools / IG IP Addresses in the mock db can be improved, as there's currently a fair amount of duplication that ends up confusing things.

So this is still a draft, as I figure we have some things to talk through.

Nevertheless, here's the stub of the tabbed pages for Internet Gateways:

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[benjaminleonard]

In general I think we're better off holding for the next release to get the implementation right for churn reasons.

Let's catch up on this today. I might be a helpful eye for this, since I haven't read up on internet gateways yet, so I can play the idiot seeing this for the first time – a role a know and love.

I notice we're also missing breadcrumbs – is that #1527 ?

[charliepark]

Good point on the breadcrumbs. Have added those in, but I think your larger point is a good one — there'll be more than just the breadcrumbs to discuss, and holding back on the feature for a release to get it right could be the better call. Will look forward to talking through it.

[charliepark]

This isn't necessary, as we have the MoreActionsMenu button in the header with the Copy ID button, but I didn't see a clear "fourth" aspect to the internet gateway metadata to highlight. If we do keep this, we can drop the MoreActionsMenu, as it's redundant. I suspect dropping this one is the better approach, though, if we can figure out what to put here in its place.