feat(deploy): Simplifies deploy overview (#508)

This simplifies the deploy overview, to only show 3 version fields:
- CURRENT DEPLOYMENT
- CURRENT ENV
- NEW DEPLOYMENT

It also fixes a few errors around version detection

Reviewed-on: toolshed/abra#508
Co-authored-by: p4u1 <p4u1_f4u1@riseup.net>
Co-committed-by: p4u1 <p4u1_f4u1@riseup.net>

tests/integration/helpers/app.bash

@@ -30,6 +30,15 @@ _undeploy_app() {
   assert_output --partial 'unknown'
 }
 
+_undeploy_app2() {
+  run $ABRA app undeploy "$1" --no-input
+
+  run $ABRA app ls --server "$TEST_SERVER" --status
+  assert_success
+  assert_output --partial "$1"
+  assert_output --partial 'unknown'
+}
+
 _rm_app() {
   # NOTE(d1): not asserting outcomes on teardown here since some might fail
   # depending on what the test created. all commands run through anyway