Add overview of custom NGF policies #6217

Job	Run time
Checks and variables	1m 41s
Unit Tests	2m 28s
NJS Unit Tests	19s
Build Binary	1m 42s
Build Plus images / build	1m 0s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	42s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	57s
Helm Tests	0s
Functional tests (nginx, v1.25.16) / Run Tests	6m 1s
Functional tests (nginx, v1.30.0) / Run Tests	5m 27s
Functional tests (plus, v1.25.16) / Run Tests	5m 32s
Functional tests (plus, v1.30.0) / Run Tests	5m 42s
Package and Publish Helm Chart	0s
Conformance tests (nginx, v1.25.16, true) / Run Tests	6m 39s
Conformance tests (nginx, v1.25.16, false) / Run Tests	6m 33s
Conformance tests (nginx, v1.30.0, false) / Run Tests	6m 11s
Conformance tests (nginx, v1.30.0, true) / Run Tests	5m 45s
Conformance tests (plus, v1.25.16, false) / Run Tests	5m 51s
Conformance tests (plus, v1.25.16, true) / Run Tests	5m 59s
Conformance tests (plus, v1.30.0, false) / Run Tests	5m 27s
Conformance tests (plus, v1.30.0, true) / Run Tests	6m 12s
	1h 20m 8s

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