roachtest: use high connect timeout in election test

It's possible the default of 5s is simply too tight, but as an easy
indication for that we can see what total duration the test takes
assuming it gets plenty of time to connect.

Closes #31615.

Release note: None

pkg/cmd/roachtest/election.go

@@ -57,7 +57,11 @@ func registerElectionAfterRestart(r *registry) {
 			// this up are working (we trigger elections eagerly, but not so
 			// eagerly that multiple elections conflict with each other).
 			start = timeutil.Now()
-			buf, err := c.RunWithBuffer(ctx, t.l, c.Node(1), `./cockroach sql --insecure -e "
+			// Use a large CONNECT_TIMEOUT so that if the initial connection
+			// takes ages (perhaps due to some cli-internal query taking a
+			// very long time), we fail with the duration check below and
+			// not an opaque error from the cli.
+			buf, err := c.RunWithBuffer(ctx, t.l, c.Node(1), `COCKROACH_CONNECT_TIMEOUT=240 ./cockroach sql --insecure -e "
 SET TRACING = on;
 SELECT * FROM test.kv;
 SET TRACING = off;