Turn metrics back on

[david-crespo]

This is mostly uncommenting or redoing stuff that was already here from #1214. This PR includes:

• Bump API to latest omicron main
• Turn back on system-level and silo-level utilization pages
• Ben's polish in Metrics design touchup #1331
• Prefetch instance disks in a loader so the disk metrics tab thing works better
• Change the way we're doing code splitting (see below)

Note on code splitting

We were doing code splitting by dynamically importing page components for pages with large libraries (in this case Recharts). When there was only one (the instance metrics tab) this had a reasonable result: a decent-sized MetricsTab.js file split out from the main app.js

However, it turns out Vite is smarter than I thought, and once I added two more pages using Recharts, we got this: Vite knows all the pages have TimeSeriesChart in common, so it automatically extracts that into its own separate file, leaving all the page-specific files very small, like 1-2 KB. There's no point in having separate files for them if they're small!

So, I changed it so the pages are regular imports and inside they import TimeSeriesChart dynamically, which means only TimeSeriesChart gets its own file.

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