upgrade flux v2 dependencies take 4

[chanwit]

Fixes #3878

See the counter part #3880 which uses controller runtime v0.15

Notable differences:

// Replace k8s.io packages v0.26 to downgrade controller-runtime to v0.14.6
replace (
	k8s.io/api => k8s.io/api v0.26.3
	k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.26.3
	k8s.io/apimachinery => k8s.io/apimachinery v0.26.3
	k8s.io/cli-runtime => k8s.io/cli-runtime v0.26.3
	k8s.io/client-go => k8s.io/client-go v0.26.3

	sigs.k8s.io/controller-runtime => sigs.k8s.io/controller-runtime v0.14.6
)

[enekofb]

fantastic work.

some follow up topics before approving:

• verify gitops run
• understand experience for not v2 users (using with flux v0.4x) -> done here
• verify cli

and a couple of follow-up tickets

• to prepare release notes and update documentation https://docs.gitops.weave.works/docs/guides/fluxga-upgrade/
• to potentially implement multiple kind versions querying

[enekofb]

Understand Breaking Change - experience for not v2 users (using with flux v0.4x)

To document what they will see

Given wego with flux v0.41.2

I could see errors for Sources for not finding v1/GitRepository

I could see errors for Sources for not finding v1/Kustomizations

[enekofb]

🟢 quick test cli works in PR

➜  weave-gitops git:(flux-v2-take-4-cr-14) ./bin/gitops create dashboard gitops --password=BDASDFASDF                                
✚ Generating GitOps Dashboard manifests ...
► Creating GitOps Dashboard objects ...
✚ Generating GitOps Dashboard manifests ...
✔ Generated GitOps Dashboard manifests
► Checking for a cluster in the kube config ...
► Checking if Flux is already installed ...
► Getting Flux version ...
✔ Flux v2.0.0 is already installed on the flux-system namespace.
► Applying GitOps Dashboard manifests
► Installing the GitOps Dashboard ...
✔ GitOps Dashboard has been installed
► Request reconciliation of dashboard (timeout 3m0s) ...
◎ Waiting for GitOps Dashboard reconciliation
✔ GitOps Dashboard gitops is ready
✔ Installed GitOps Dashboard

➜  weave-gitops git:(flux-v2-take-4-cr-14) ./bin/gitops check                                                                 <aws:sts>
✔ Kubernetes 1.24.0 >=1.20.6-0


Use "gitops remove [command] --help" for more information about a command.
➜  weave-gitops git:(flux-v2-take-4-cr-14) ./bin/gitops get config                                                            <aws:sts>
✔ Your CLI configuration for Weave GitOps:
{
  "analytics": true,
  "userId": "a5OoZqPd+p"
}

[chanwit]

gitops run confirmed to work

[enekofb]

🚀