roachprod: use exit-on-error:false for crdb log cfg

See cockroachdb#62763.

We seem to frequently miss the runtime errors resulting from
out-of-memory conditions in the stderr logs. We don't understand
exactly why yet, but it is very likely that with `exit-on-error`
(which is true by default) we are hitting errors outputting to
the sink which then kill the process before the runtime errors
bubble up.

While we develop a proper fix, avoid the problematic configuration
on roachprod clusters, which notably includes roachtests.

Release note: None

pkg/cmd/roachprod/install/cockroach.go

@@ -457,7 +457,8 @@ func (h *crdbInstallHelper) generateStartArgs(
 	}
 
 	logDir := h.c.Impl.LogDir(h.c, nodes[nodeIdx])
-	args = append(args, "--log-dir="+logDir)
+	// Specify exit-on-error=false to work around #62763.
+	args = append(args, `--log "file-defaults: {dir: '`+logDir+`', exit-on-error: false}"`)
 
 	if vers.AtLeast(version.MustParse("v1.1.0")) {
 		cache := 25