v2.3.0-rc3

Bug fixes:

• [k8s,k8s/ingress] Support Kubernetes Ingress pathType (#7087 by rtribotte)
• [k8s,k8s/ingress] Use semantic versioning to enable ingress class support (#7065 by kevinpollet)
• [provider] file parser: skip nil value. (#7058 by ldez)

Documentation:

• [ecs] Fix documentation for ECS (#7107 by mmatur)
• [k8s] Add migration documentation for IngressClass (#7083 by kevinpollet)
• [plugins] Update availability info (#7060 by PCM2)

Misc:

• Merge current v2.2 branch into v2.3 (#7116 by ldez)
• Merge current v2.2 branch into v2.3 (#7086 by jbdoumenjou)