Add SnippetsFilter guide #8812

Job	Run time
Checks and variables	1m 36s
Unit Tests	42s
NJS Unit Tests	15s
Build Binary	20s
Build Plus images / build	46s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	1m 13s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 0s
Helm Tests	0s
Functional tests (nginx, v1.25.16) / Run Tests	12m 58s
Functional tests (nginx, v1.31.1) / Run Tests	12m 36s
Functional tests (plus, v1.25.16) / Run Tests	12m 31s
Conformance tests (nginx, v1.25.16, false) / Run Tests	5m 58s
Conformance tests (nginx, v1.25.16, true) / Run Tests	5m 49s
Conformance tests (nginx, v1.31.1, false) / Run Tests	5m 20s
Conformance tests (nginx, v1.31.1, true) / Run Tests	5m 36s
Conformance tests (plus, v1.25.16, false) / Run Tests	5m 44s
Functional tests (plus, v1.31.1) / Run Tests	12m 26s
Conformance tests (plus, v1.25.16, true) / Run Tests	5m 51s
Conformance tests (plus, v1.31.1, false) / Run Tests	5m 20s
Package and Publish Helm Chart	0s
Conformance tests (plus, v1.31.1, true) / Run Tests	6m 4s
	1h 42m 5s

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