CP-43314: Add release notes for 1.2.12 #4037

Job	Run time
Build Docker image for linux/arm64	4m 56s
Build Docker image for linux/amd64	5m 23s
Merge Docker manifests	1m 1s
k8s-version-matrix-tests / config-test-federated-mode	3m 46s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.29.15	3m 41s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.25.16	3m 53s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.22.17	3m 3s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.21.14	4m 5s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.30.11	2m 30s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.31.7	3m 46s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.28.14	2m 37s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.33.5	3m 48s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.26.15	2m 38s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.34.1	2m 37s
replicated-compatibility-matrix-tests	0s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.27.16	3m 51s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.32.3	2m 34s
k8s-version-matrix-tests / linux/amd64-k8s-test-v1.23.17	4m 24s
k8s-version-matrix-tests / linux/arm64-k8s-test-v1.24.17	2m 35s
test-replicated-status-reporting	0s
test-versions-status-reporting	3s
docker-build-status-reporting	5s
release-image	-1s
	1h 1m 15s

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