Update vitest monorepo to ^3.1.1 #12214

Job	Run time
Checks and variables	1m 10s
Unit Tests	48s
NJS Unit Tests	13s
Build Binary	25s
Build Plus images / build	53s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 8s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	1m 1s
Helm Tests	0s
Functional tests (nginx, v1.25.16) / Run Tests	13m 52s
Functional tests (nginx, v1.32.3) / Run Tests	12m 37s
Functional tests (plus, v1.25.16) / Run Tests	14m 1s
Functional tests (plus, v1.32.3) / Run Tests	13m 18s
Conformance tests (nginx, v1.25.16, false) / Run Tests	6m 49s
Conformance tests (nginx, v1.25.16, true) / Run Tests	7m 0s
Conformance tests (nginx, v1.32.3, false) / Run Tests	6m 37s
Package and Publish Helm Chart	0s
Conformance tests (nginx, v1.32.3, true) / Run Tests	6m 52s
Conformance tests (plus, v1.25.16, false) / Run Tests	7m 16s
Conformance tests (plus, v1.25.16, true) / Run Tests	7m 13s
Conformance tests (plus, v1.32.3, false) / Run Tests	6m 37s
Conformance tests (plus, v1.32.3, true) / Run Tests	6m 38s
	1h 54m 28s

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