unclear user feedback after running gitops apply/install flux

[2opremio]

Right now neither install flux nor gitops apply give you a clear confirmation of everything is working after the commands finish succesfully:

1. eksctl install flux confirms that Flux and the Helm Operator are running but not a 100% confirmation of flux being capable of deploy workloads. Validation stops when asking the user to whitelist Flux's SSH key.

2. eksctl gitops apply doesn't confirm that the profile was actually deployed nor that the workloads are working as expected.

Improving (1) and (2) is hard for different reasons:

• (1) eksctl install flux currently requires manual intervention. I am not sure we can do much better without bypassing the SSH key addition (e.g. by providing the SSH key ourselves Add a way to provide the Flux SSH key, instead of port-forwarding to retrieve it #1213 ) or blocking to wait for the user to add the SSH key and confirm it was added succesfully.
• (2) Is really hard for deeper reasons:
  a. Flux doesn't give you clear machine-friendly feedback on whether the deployment went well (some users have gone as far as parsing the Flux logs to gather this information).
  b. Kubernetes doesn't provide a general feedback mechanism telling you whether a set of resources have been deployed successfully (for some definition of successfully). We could evaluate the state of the deployed resources on a case by case basis, but I think that's completely out of scope for eksctl.

[Callisto13]

Closing: #2963