fix(azure): make the dns resource group optional

[mrsimonemms]

Description

This makes the resource group for Azure DNS optional.

Once accepted, this will require an update of the designs of the console to remove the required field on the Azure DNS section @donnalux @CristhianF7

Related Issue(s)

Fixes #2338

How to test

1. Ensure that the CLI and API branches are loaded (see Make Azure DNS resource group is an optional parameter #2330 for branches)
2. Add a replace in the CLI's go.mod

   replace (
     github.com/konstructio/kubefirst-api => ../kubefirst-api
   )

3. Run the normal command without the --dns-azure-resource-group flag:

GitHub - Azure DNS

go run . beta azure create \
  --alerts-email <email> \
  --github-org <org> \
  --domain-name <domain> \
  --gitops-template-branch sje/azure-optional-dns

GitLab - Azure DNS

go run . beta azure create \
  --alerts-email <email> \
  --domain-name <domain> \
  --git-provider gitlab \
  --gitlab-group <group> \
  --gitops-template-branch sje/azure-optional-dns

GitHub - Cloudflare DNS

go run . beta azure create \
  --alerts-email <email> \
  --github-org <org> \
  --domain-name <domain> \
  --gitops-template-branch sje/azure-optional-dns \
  --dns-provider cloudflare \
  --subdomain <subdomain>

GitLab - Cloudflare DNS

go run . beta azure create \
  --alerts-email <email> \
  --domain-name <domain> \
  --git-provider gitlab \
  --gitlab-group <group> \
  --gitops-template-branch sje/azure-optional-dns \
  --dns-provider cloudflare \
  --subdomain <subdomain>