docs: Improve onStackTrace docs to include limitations and tips (#8905)

Author: akaltar

docs/config/index.md

@@ -1927,17 +1927,21 @@ export default defineConfig({
 
 - **Type**: `(error: Error, frame: ParsedStack) => boolean | void`
 
-Apply a filtering function to each frame of each stack trace when handling errors. The first argument, `error`, is an object with the same properties as a standard `Error`, but it is not an actual instance.
+Apply a filtering function to each frame of each stack trace when handling errors. This does not apply to stack traces printed by [`printConsoleTrace`](#printConsoleTrace). The first argument, `error`, is a `TestError`.
 
 Can be useful for filtering out stack trace frames from third-party libraries.
 
+::: tip
+The stack trace's total size is also typically limited by V8's [`Error.stackTraceLimit`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/stackTraceLimit) number. You could set this to a high value in your test setup function to prevent stacks from being truncated.
+:::
+
 ```ts
-import type { ParsedStack } from 'vitest'
+import type { ParsedStack, TestError } from 'vitest'
 import { defineConfig } from 'vitest/config'
 
 export default defineConfig({
   test: {
-    onStackTrace(error: Error, { file }: ParsedStack): boolean | void {
+    onStackTrace(error: TestError, { file }: ParsedStack): boolean | void {
       // If we've encountered a ReferenceError, show the whole stack.
       if (error.name === 'ReferenceError') {
         return