[Discover][Traces] Adding error marks to unified trace waterfall #245161
+289
−367
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Part of #244046
FYI: Agent marks will be add on another PR.
Screen.Recording.2025-12-03.at.14.51.54.mov
Good to know:
We use to have three types of error definitions on APM
WaterfallError,UnifiedErrorandError, I merge them all to useError.