fix(helm): Fix support for ingress.ingressClassName

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SUMMARY

In #18617 @joatkh reported removed support for ingress.ingressClassName in values.yaml of our Chart. It is an undocumented parameter but supported by our Chart:

superset/helm/superset/templates/ingress.yaml

Lines 33 to 35 in 1fbdabd

	{{- if .Values.ingress.ingressClassName }}
	ingressClassName: {{ .Values.ingress.ingressClassName }}
	{{- end }}

That PR re-add that support.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Use ingress.ingressClassName eg. via --set during installation. It should pass validation.

ADDITIONAL INFORMATION

• Has associated issue: Can't use property ingressClassName in Helm Chart value file from 0.5.5 to 0.5.6 #18617
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

@joatkh could you give a shoot to test if it's working for you?
@craig-rueda could you take a look as maintainer of Chart?