pkg/report: improve Go throw/panic parsing

This several small improvements:
1. Move these patterns into the common part.
   We run Go code on (almost) all OSes and error messages
   are the same for all of them.
2. Detect "fatal error:" as a bug as well.
   This is what I currently see from Go 1.20 runtime,
   but we don't recognize it, so these reports probably
   go into "lost connection" bucket now (bad).
3. Add a pattern for panic(ENOMEM) message.
   pkg/image/compression_optimized.go can produce it
   on mmap failure.
4. Add tests.

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