Fix replicalimits ConstraintTemplate to handle scaling to zero properly. Fixes #419 #1378

Job	Run time
Verify assertions in suite.yaml files	17s
generate	3m 36s
Require a sync.yaml file and metadata.gatekeeper.sh/requires-sync-data annotation for every templ...	3m 7s
Require a suite.yaml file alongside every template.yaml	13s
Test scripts	1m 49s
Integration test on Gatekeeper release-3.13	10m 12s
Unit test on ubuntu-latest opa v0.42.2	12s
Integration test on Gatekeeper release-3.14	9m 46s
Unit test on macos-latest opa v0.42.2	14s
	29m 26s

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