[DebugExporter] Add EventName from LogRecord to output #21819

Job	Run time
windows-service-test (windows-2022)	4m 27s
windows-service-test (windows-2022)	4m 27s
windows-service-test (windows-2025)	1m 10s
windows-service-test (windows-2025)	1m 10s
windows-unittest (windows-2022)	10m 44s
windows-unittest (windows-2022)	18m 41s
windows-unittest (windows-2025)	20m 19s
windows-unittest (windows-2025)	20m 19s
	1h 21m 17s

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