[Create survey] Enable "Continue" button on validation errors and show message when clicked

[jcqli]

@gino-m @vittorino Are there mocks for what the message looks like?

[gino-m]

Don't think we need mocks here, this is a change to the behavior of the existing UI.

[kenstershiro]

@gino-m which validation errors is this referring to, survey creation or entry?

[gino-m]

[@gino-m](https://github.com/gino-m) which validation errors is this referring to, survey creation or entry?

On the "create survey" flow. I believe this was already implemented for "edit survey" wrt "Publish changes". @rfontanarosa Please cmiiw.