travis: enable test suite on ARM64 (#20219)

* travis: Enable ARM support

* Include fixes from 20039

* Add a trace to debug the invalid lookup issue

* Try increasing the timeout to see if the arm test passes

* Investigate the resolver issue

* Increase arm64 timeout for clique test

* increase timeout in tests for arm64

* Only test the failing tests

* Review feedback: don't export epsilon

* Remove investigation tricks+include fjl's feeback

* Revert the retry ahead of using the mock resolver

* Fix rebase errors

metrics/sample_test.go

@@ -1,6 +1,7 @@
 package metrics
 
 import (
+	"math"
 	"math/rand"
 	"runtime"
 	"testing"
@@ -326,7 +327,7 @@ func testUniformSampleStatistics(t *testing.T, s Sample) {
 	if 7380.5 != ps[1] {
 		t.Errorf("75th percentile: 7380.5 != %v\n", ps[1])
 	}
-	if 9986.429999999998 != ps[2] {
+	if math.Abs(9986.429999999998-ps[2]) > epsilonPercentile {
 		t.Errorf("99th percentile: 9986.429999999998 != %v\n", ps[2])
 	}
 }