Enabling of Default Backend access log for location / (404)

[cattapan]

Be able to enable access log for the default backend location /. It's super hard to troubleshoot errors 404, when the Host header is "wrong" (i.e: does not match any of the ingress rules)

[k8s-ci-robot]

@cattapan: This issue is currently awaiting triage.

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[rymir]

@cattapan I think I've been looking for the same feature you're requesting and was successful in enabling the default backend access logs by using the configuration option in https://github.com/kubernetes/ingress-nginx/blob/e6ff97fbbe4efc39ec673a3ecda734a9a0e880b7/internal/ingress/controller/config/config.go#L121