Clear stale deploy logs between integration test runs

The OTel collector files were already cleared, but deploy log files
in /tmp/kamal-deploy-logs/ were not, which could cause
assert_deploy_log to match stale content from prior test cases.

Author: djmb

test/integration/integration_test.rb

@@ -7,7 +7,7 @@ class IntegrationTest < ActiveSupport::TestCase
     docker_compose "up --build -d"
     wait_for_healthy
     setup_deployer
-    deployer_exec("sh -c 'rm -f /tmp/otel/*.json'", workdir: "/")
+    deployer_exec("sh -c 'rm -f /tmp/otel/*.json /tmp/kamal-deploy-logs/*'", workdir: "/")
     @app = "app"
   end