[Epic] Add Integration Test for all server/agent flags

[rancher-max]

Similar to #6056, but this is for a single test that uses ALL (or the most possible) configuration flags.

EDIT 04/11/23
Integration Server Flags Testing Status

Server flags:
disable	disable-network-policy	with-node-id
write-kubeconfig-mode	flannel-external-ip	selinux
cluster-init	disable-scheduler	node-taint
data-dir	token	server
node-label	cluster-cidr	node-name
flannel-ipv6-masq	node-ip	kubelet-arg
bind-address	snapshotter	secrets-encryption
node-external-ip	disable-helm-controller	flannel-iface
service-cidr	multi-cluster-cidr	tls-san
flannel-backend	etcd-arg	prefer-bundled-bin
debug	kube-proxy-arg	kube-controller-manager-arg
write-kubeconfig	etcd-snapshot-retention	log
agent-token-file	kube-apiserver-arg	disable-cloud-controller
resolv-conf	etcd-expose-metrics	lb-server-port
https-listen-port	advertise-port	cluster-dns
etcd-snapshot-name	default-local-storage-path	vmodule
kube-scheduler-arg	kube-cloud-controller-manager-arg	token-file
etcd-disable-snapshots	etcd-snapshot-schedule-cron	etcd-snapshot-dir
disable-kube-proxy	advertise-address	agent-token
datastore-cafile	etcd-snapshot-compress	alsologtostderr
servicelb-namespace	egress-selector-mode	config
protect-kernel-defaults	enable-pprof	service-node-port-range
cluster-reset-restore-path

The following flags are unsuited for Integration test

Not For Integration Test
❌ system-default-registry	❌ cluster-domain	❌ etcd-s3-folder
❌ private-registry	❌ etcd-s3-region	❌ etcd-s3
❌ datastore-endpoint	❌ image-credential-provider-bin-dir	❌ docker
❌ datastore-certfile	❌ etcd-s3-secret-key	❌ pause-image
❌ etcd-s3-access-key	❌ flannel-cni-conf	❌ rootless
❌ datastore-keyfile	❌ etcd-s3-insecure	❌ etcd-s3-skip-ssl-verify
❌ container-runtime-endpoint	❌ image-credential-provider-config	❌ etcd-s3-endpoint
❌ etcd-s3-endpoint-ca	❌ etcd-s3-bucket	❌ etcd-s3-timeout
❌ flannel-conf	❌ cluster-reset

[caroline-suse-rancher]

@rancher-max is this still in progress?

[rancher-max]

Yes I don't think any of us have picked it up to start working yet.

[caroline-suse-rancher]

I'll move milestones then, thank you!

[caroline-suse-rancher]

@osodracnai Hey! Are you still working on this? The last linked PR I see is from May. Thanks!

[osodracnai]

@caroline-suse-rancher Yeah, but not only focused on it. If you want i can make it my priority.

[caroline-suse-rancher]

@osodracnai No, no worries! Just asking for a status update, that sounds good :)

[dereknola]

Closing this as complete, all easily testable flags via integration test have been covered.