fix(reporter): use default error formatter for JUnit

[hi-ogawa]

Description

• closes JUnit reporter: ‘Unknown Error: undefined’ #5603

Since we now have reusable printErrorWrapper (introduced for github actions reporter #5093) to generate the default error formatting, probably using it for Junit would make sense.

This wrapper supports all the good things automatically:

• expected/actual diff
• stack
• formatting of throw {somePlainObject} (which is what OP mentioned)

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Tests

• Run the tests with pnpm test:ci.

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[hi-ogawa]

I stripped the color for now, but it would be cool to have diff color if we can expect many consumers of junit reporter supports ansi code on their UI.
From the OP's screenshot, CircleCI probably supports it.

[hi-ogawa]

I just noticed I've been pushing a branch directly on this repo...
Let me close this one and I'll recreate a PR from my fork