chore: upgrade to storybook@8

[marcustyphoon]

• check this side-by-side with the current storybook to ensure no options/panes/whatever are obviously missing

Well this absolutely sucked to do. But we have 0 security warnings after this!

[marcustyphoon]

Re: the last couple of commits. We have a choice between having the RDC storybook

• Use a webpack override to import and use a compiled version of gw2-ui (which it gets via symlink from the "@discretize/gw2-ui-new": "workspace:^", package dependency due to PNPM). This requires the import '@discretize/gw2-ui-new/dist/index.css'; line and will only update gw2-ui when the developer runs the build script.
• import the unbuilt gw2-ui source and feed it, including raw css modules, to webpack. This enables hot reload, instantly updating the RDC storybook when the developer saves changes to gw2-ui. It also breaks the import '@discretize/gw2-ui-new/dist/index.css'; line since the source doesn't have a file called index.css.
• Split the difference in dev and prod. This... doesn't really work.

[gw2princeps]

Option 2 seems most sensible to me. What option are you leaning towards?

[marcustyphoon]

I implemented option 2! Seems to work well.