Add tracing how-to guide #5962

Job	Run time
Checks and variables	1m 28s
NJS Unit Tests	14s
Unit Tests	2m 15s
Build Binary	1m 39s
Build Plus images / build	40s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	40s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 4s
Helm Tests	1m 12s
Conformance tests (nginx, 1.25.16, true) / Run Tests	12m 41s
Conformance tests (nginx, 1.25.16, false) / Run Tests	14m 47s
Conformance tests (nginx, latest, false) / Run Tests	14m 13s
Conformance tests (nginx, latest, true) / Run Tests	10m 10s
Conformance tests (plus, 1.25.16, false) / Run Tests	12m 26s
Conformance tests (plus, 1.25.16, true) / Run Tests	11m 48s
Conformance tests (plus, latest, false) / Run Tests	10m 55s
Conformance tests (plus, latest, true) / Run Tests	10m 30s
Functional tests (nginx, 1.25.16) / Run Tests	4m 52s
Functional tests (nginx, latest) / Run Tests	4m 35s
Functional tests (plus, 1.25.16) / Run Tests	4m 22s
Functional tests (plus, latest) / Run Tests	4m 21s
Package and Publish Helm Chart	0s
	2h 4m 52s

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