Updated new annotation : ingressClassName: nginx

[HoussemDellai]

Replaced old annotation:
annotations:
kubernetes.io/ingress.class: nginx

with new one:
ingressClassName: nginx

Description

Fixes #ISSUE

Checklist

• Unit tests updated
• End user documentation updated

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[szuecs]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HoussemDellai, jlamillan, szuecs

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