Refactor lint-test.yaml GHA Workflow to use a matrix for test job generation; Add `nginx.enabled` and `hpa.enabled` tests #996

Job	Run time
changes	6s
lint	24s
run-tests (Default - no custom values)	1m 54s
run-tests (PostgreSQL Enabled, --helm-extra-set-args "--set=postgresql.enabled=true --set=postgre...	2m 25s
run-tests (Nginx Enabled, --helm-extra-set-args "--set=image.flavor=fpm --set=nginx.enabled=true")	2m 5s
run-tests (Horizontal Pod Autoscaling Enabled, --helm-extra-set-args "--set=hpa.enabled=true --se...	1m 44s
	8m 38s

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