fix(diff): truncate to avoid crash on diff large objects

[hi-ogawa]

Description

• Closes Crash when printing diff of playwright ElementHandle #7009

This isn't fool-proof for all situations, but it seems to help dealing with some cases.

For playwright's case, the large formatting happens because of callToJSON: false, which is used only when comparing against two different "types" of objects (ElementHandle vs null in the repro's case). ElementHandle.toJSON is something compact like this:

Object {
  "_guid": "handle@c697bfba7ffbd40d2511ee19416963a8",
  "_type": "ElementHandle",
}

vitest/packages/utils/src/diff/index.ts

Lines 58 to 62 in f9a6284

	const FALLBACK_FORMAT_OPTIONS = {
	callToJSON: false,
	maxDepth: 10,
	plugins: PLUGINS,
	}

I also noticed prettyFormat actually succeeds, but large memory consumption happens probably later when going through RPC etc... So the fix here is to just truncate beforehand for FALLBACK_FORMAT_OPTIONS case and also reduce the default FALLBACK_FORMAT_OPTIONS.maxDepth a little.

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