Add icon to error messages in debug console

[roblourens]

The debug console only distinguishes between stdout/stderr in text color. Objects logged as errors don't get marked as errors at all.

This code

console.log('foo')
console.error('foo')
console.error({a: 1})

produces messages rendered like this:

This could be an accessibility issue. At least, adding icons would give us a way to mark objects as an error but still have them colored differently

From discussion in #138091 (comment)

[VSCodeTriageBot]

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