test: less fragile integration suite [ci skip]

See coop-cloud/organising#584
See coop-cloud/organising#595

tests/integration/app_remove.bats

@@ -18,10 +18,11 @@ setup(){
 }
 
 teardown(){
-  # https://github.com/bats-core/bats-core/issues/383#issuecomment-738628888
-  if [[ -z "${BATS_TEST_COMPLETED}" ]]; then
-    _undeploy_app
+  if [[ ! -f "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env" ]]; then
+    _new_app
   fi
+
+  _undeploy_app
 }
 
 @test "validate app argument" {
@@ -40,8 +41,6 @@ teardown(){
 
   run $ABRA app rm "$TEST_APP_DOMAIN" --no-input
   refute_output --partial 'ALERTA'
-
-  _new_app
 }
 
 # bats test_tags=slow
@@ -51,8 +50,6 @@ teardown(){
   run $ABRA app rm "$TEST_APP_DOMAIN" --no-input
   assert_failure
   assert_output --partial 'is still deployed'
-
-  _undeploy_app
 }
 
 @test "detect no secrets to remove" {
@@ -71,8 +68,6 @@ teardown(){
   run $ABRA app rm "$TEST_APP_DOMAIN" --no-input
   assert_success
   assert_output --partial 'no secrets to remove'
-
-  _new_app
 }
 
 @test "remove secrets" {
@@ -90,8 +85,6 @@ teardown(){
 
   sanitisedDomainName="${TEST_APP_DOMAIN//./_}"
   assert_output --partial "$sanitisedDomainName_test_pass_one_v1 removed"
-
-  _new_app
 }
 
 # bats test_tags=slow
@@ -115,8 +108,6 @@ teardown(){
   run $ABRA app rm "$TEST_APP_DOMAIN" --no-input
   assert_success
   assert_output --partial 'no volumes to remove'
-
-  _new_app
 }
 
 # bats test_tags=slow
@@ -133,8 +124,6 @@ teardown(){
   assert_success
   assert_output --partial 'test-volume'
   assert_output --partial 'removed'
-
-  _new_app
 }
 
 @test "remove .env file" {
@@ -144,6 +133,4 @@ teardown(){
   assert_success
 
   assert_not_exists "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
-
-  _new_app
 }