ci: new env variable to set --feature-gates (#1166)

**What problem does this PR solve?**:
Expose an env variable to enable `--feature-gates` when deploying a
dev/CI cluster.

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
<!--
Please describe the tests that you ran to verify your changes.
Provide output from the tests and any manual steps needed to replicate
the tests.
-->

**Special notes for your reviewer**:
<!--
Use this to provide any additional information to the reviewers.
This may include:
- Best way to review the PR.
- Where the author wants the most review attention on.
- etc.
-->

Author: dkoshkin

make/dev.mk

@@ -1,6 +1,8 @@
 # Copyright 2023 Nutanix. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+CAREN_FEATURE_GATES ?= ""
+
 .PHONY: dev.run-on-kind
 dev.run-on-kind: export KUBECONFIG := $(KIND_KUBECONFIG)
 dev.run-on-kind: kind.create clusterctl.init
@@ -16,6 +18,7 @@ dev.run-on-kind:
 		--set-string image.repository=ko.local/cluster-api-runtime-extensions-nutanix \
 		--set-string image.tag=$(SNAPSHOT_VERSION) \
 		--set-string helmRepository.images.bundleInitializer.tag=$(SNAPSHOT_VERSION) \
+		--set extraArgs.feature-gates="$(CAREN_FEATURE_GATES)" \
 		--wait --wait-for-jobs
 	kubectl rollout restart deployment cluster-api-runtime-extensions-nutanix
 	kubectl rollout restart deployment helm-repository