CLI-1217: push:artifact should infer app id from env id

[danepowell]

Motivation

I was trying to deploy code from a repo to a new application not already linked to that repo and was confused when it produced a Cloud API error because it was inferring the app id from .acquia-cli.yml rather than the more explicit env id.

Proposed changes

Alternatives considered

Testing steps

1. Follow the contribution guide to set up your development environment or download a pre-built acli.phar for this PR.
2. Clear the kernel cache to pick up new and changed commands: ./bin/acli ckc
3. (add specific steps for this pr)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (79d271c) 91.93% compared to head (bdf9f5f) 91.93%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1633   +/-   ##
=========================================
  Coverage     91.93%   91.93%           
- Complexity     1819     1821    +2     
=========================================
  Files           124      124           
  Lines          6509     6513    +4     
=========================================
+ Hits           5984     5988    +4     
  Misses          525      525           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.