Fix sporadic test failure in service broker deletion during creation (#5045)

The test was flaky because both create and delete jobs could be enqueued
with the same timestamp, making pickup order non-deterministic. When the
delete job ran first, the create job failed with ServiceBrokerGone.

Fix by setting a higher priority number for the delete job so the create
job always runs first.

Author: philippthun

spec/request/lifecycle/service_brokers_spec.rb

@@ -151,6 +151,10 @@
           stub_request(:get, 'http://example.org/my-service-broker-url/v2/catalog').
             with(basic_auth: %w[admin password]).
             to_return(status: 200, body: catalog, headers: {})
+
+          # Both jobs may be enqueued with the same timestamp, making pickup order non-deterministic.
+          # Give the delete job a higher priority number so the create job always runs first.
+          TestConfig.config[:jobs][:priorities] = { 'service_broker.delete': 10 }
         end
 
         it 'allows deletion during creation' do