Report ConfigMap errors when user tries to apply invalid values for the access-log

[jjngx]

This idea is a follow up of this PR: #5648

If the value for the access-log is invalid, the config map obj does not show error/warning state. The error is only visible in the NIC log, for example:

E20240809 10:59:06.679467       1 configmaps.go:212] Configmap nginx-ingress/nginx-config: Invalid value for key access-log: "ssyslog:server=localhost:514"

config-map:

...
Data
====
access-log-off:
----
true
access-log:
----
syslog:server=localhost:514
...

The main idea is to improve UX and allow users to see that objects are not applied due errors by checking (describing) the obj without a need to check NIC logs.