perf: bundle vitest's own dependencies, print a suggestion to disable isolation

[sheremet-va]

Not sure if suggestion is a good idea, but it could be a solid improvement for many codebases (but definitely not for all)

This PR also bundles vitest dependencies to reduce the boot time by reducing the time it takes Node to resolve external modules:

metric	main	branch	Δ
worker boot import (cold, min)	28.8 ms	21.3 ms	−26%
wall — forks isolate:true (min)	1029 ms	937 ms	−9%
wall — forks isolate:false	382 ms	384 ms	~0 (amortized)
worker boot modules loaded	61	45	−26%
— node: builtins	14	10	−4
— vitest dist chunks	23	28	+5
— external npm resolves	7	2	−71%
boot graph (static closure)	605 KB / 23 chunks	759 KB / 28 chunks	+154 KB / +5
dist size	2215 KB	2557 KB	+342 KB

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