Ignore unique errors for domain, route & service instances (#4641)

Commit `8b932f9f9498d2d222b981aa7dc5db7a6d16dcf7` (PR #4611) introduced
the  option to ignore `UniqueConstraintViolation`` errors for specified indexes/ constraints/ keys.
This change does the same for the domain, route and service instance model.

The ignore logic is already tested in the vcap_relations plugin (see #4611).

Author: johha

app/models/runtime/domain.rb

@@ -67,7 +67,8 @@ def shared_or_owned_by(organization_ids)
       join_table: 'organizations_private_domains',
       left_key: :private_domain_id,
       right_key: :organization_id,
-      before_add: :validate_add_shared_organization
+      before_add: :validate_add_shared_organization,
+      ignored_unique_constraint_violation_errors: %w[orgs_pd_ids]
     )
 
     add_association_dependencies(

app/models/runtime/route.rb

@@ -31,7 +31,8 @@ class InvalidOrganizationRelation < CloudController::Errors::InvalidRelation; en
                  right_key: :target_space_guid,
                  right_primary_key: :guid,
                  join_table: :route_shares,
-                 class: VCAP::CloudController::Space
+                 class: VCAP::CloudController::Space,
+                 ignored_unique_constraint_violation_errors: %w[route_shares.PRIMARY route_target_space_pk]
 
     one_to_one :route_binding
     one_through_one :service_instance, join_table: :route_bindings

app/models/services/service_instance.rb

@@ -42,7 +42,8 @@ class InvalidServiceBinding < StandardError; end
                  right_key: :target_space_guid,
                  right_primary_key: :guid,
                  join_table: :service_instance_shares,
-                 class: VCAP::CloudController::Space
+                 class: VCAP::CloudController::Space,
+                 ignored_unique_constraint_violation_errors: %w[service_instance_shares.PRIMARY service_instance_target_space_pk]
 
     many_to_many :routes, join_table: :route_bindings