chore: squelch a warning

[Rich-Harris]

tidies up the test output a bit

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[Rich-Harris]

This was a useful exercise, it flagged a few places where we were doing things wrongly (createRawSnippet validation of render function was buggy, we had an unnecessary console.trace which duplicated the existing trace in the warning, and the parent/child SSR element state was getting corrupted when unrelated errors happened). The fact that the test output now looks a lot cleaner is just a nice bonus