Do complex validations on "deploy" click and show errors per field

[abom]

Currently, we do instant validations on input change, while this is very cool, it introduces more issues in complex validations like capacity and node check.

We can do instant validation for inputs for simple constraints like required or is number, but for more complex validations like node existence or capacity check, we better to do it on "deploy" click, and just show returned errors nicely per field. This will prevent us from issue like:

• Keeping up with multiple input changes
• Doing multiple requests to other services (or implementing a complex login to cancel previous requests like we do here)
• Duplicate the work of e.g. grid client, which implements more consistent validations with zos itself.

Grid client can return a map with errors for every field, and we can just utilize this and show it in a proper way in the form.

[abom]

Another suggestion is to support standard HTML validations with type property like "email" and "url"...etc