dashboard/builders: add KI on linux-amd64-perf

The perf builder is broken on the tools repo. Add a KI for it.

Updates golang/go#53538.

Change-Id: I31873ac336a7fe681a2e1356768fd011ebcfe2b9
Reviewed-on: https://go-review.googlesource.com/c/build/+/449036
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
Auto-Submit: Heschi Kreinick <heschi@google.com>

dashboard/builders.go

@@ -2811,6 +2811,7 @@ func init() {
 		},
 		RunBench:     true,
 		SkipSnapshot: true,
+		KnownIssues:  []int{53538},
 	})
 }