Validate env query paths in app config

[coryodaniel]

We need a way for users to validate envs against params, secrets, connections before deploying. This is very susceptible to types or jq errors and the errors coming back from terraform for bad jq syntax is very cryptic. No user is going to figure out how to test this manually.

We'll need to generate fake data (cli command to validate?) for the params/connections and "try" the app blocks envs.

mass app validate? could validate the params, connections, artifacts are json schema, then do an env pass