fix: close stream for lease when lease expires (#2265)

fixes #2215

When a module lease has an error (example ctx canceled due to the verb
call ending), it used to leave the stream with the controller open
forever. This change closes that stream.

go-runtime/ftl/leases.go

@@ -129,6 +129,9 @@ func Lease(ctx context.Context, ttl time.Duration, key ...string) (LeaseHandle,
 			}
 			// Notify the handle.
 			logger.Warnf("Lease heartbeat terminated for %s: %s", leaseKeyForLogs(module, key), err)
+			if err := lease.client.Release(ctx, key); err != nil {
+				logger.Warnf("Could not close lease %s: %s", leaseKeyForLogs(module, key), err)
+			}
 			lease.state.open = false
 			lease.state.err = optional.Some(err)
 			return