Add PDB on linkerd-viz Helm chart #3024

Job	Run time
cleanup	3s
tag	3s
changed-viz	10s
changed-policy	9s
changed-multicluster	13s
build-core (controller)	2m 22s
build-core (policy-controller)	5m 40s
build-cli	2m 30s
build-ext (jaeger-webhook)	2m 12s
build-core (proxy)	2m 22s
build-ext (metrics-api)	2m 16s
build-ext (tap)	2m 14s
build-ext (web)	4m 1s
test-ext (cluster-domain)	3m 57s
test-ext (default-policy-deny)	3m 57s
test-core (deep)	3m 14s
test-ext (external)	5m 28s
test-ext (rsa-ca)	2m 31s
test-viz	5m 33s
test-ext (helm-upgrade)	5m 27s
test-ext (uninstall)	3m 43s
test-multicluster	0s
test-ext (upgrade-edge)	5m 25s
test-policy	0s
test-ext (upgrade-stable)	5m 12s
	1h 8m 42s

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