Add webhookUrl optional property to the GitServer spec

[zmotso]

Is your feature request related to a problem? Please describe.
We need to have the possibility to redefine the webhook URL. For example, GCP uses HTTPRoute instead of Ingress, and our current approach(webhook URL is taken from hardcoded reference to Ingress) doesn't work.

Describe the solution you'd like

• We need to extend the GitServer specification by adding a new field called webhookUrl. This field will be used to define the webhook URL.
• The codebase-operator should first check this new field; if it is not defined, then it should try to use the current approach to get the URL from the ingress.
• If both methods fail to retrieve the URL, then the codebase-operator should fail with an error message stating that it cannot set the webhook URL.

Additional context
Add any other context or screenshots about the feature request here.

[zmotso]

Done. GitServer example:

kind: GitServer
apiVersion: v2.edp.epam.com/v1
metadata:
  name: gitlab
spec:
  gitHost: gitlab.com
  httpsPort: 443
  nameSshKeySecret: ssh-key
  sshPort: 22
  gitProvider: gitlab
  webhookUrl: https://test.com:8080/webhook