Set an upper bound of 180s for the runtime tests to complete

This will help us debug hanging local cluster tests because it will force
the printing of stderr/logs of the node processes.

Author: tillrohrmann

.config/nextest.toml

@@ -0,0 +1,2 @@
+[profile.default]
+slow-timeout = { period = "60s", terminate-after = 3 }