[chore][exporter/signalfx] Attempt to resolve failing test (open-tele…

…metry#27608)

**Description:** 
The APM correlation test is failing with too many retry updates. The
solution is to increase the `CleanupInterval` to allow the test time to
make multiple correlation calls within the same dedup cleanup interval.
I posted the full description in [this issue
comment.](open-telemetry#27059 (comment))

Before this fix this test would fail _almost_ every time since it was
introduced into this repo, I haven't seen any failure since this update
(9 successful runs).

**Link to tracking Issue:** Resolves open-telemetry#27059

exporter/signalfxexporter/internal/apm/correlations/client.go

@@ -146,7 +146,7 @@ func (cc *Client) putRequestOnChan(r *request) error {
 
 func (cc *Client) putRequestOnRetryChan(r *request) error {
 	// handle request counter
-	if requestcounter.GetRequestCount(r.ctx) == cc.maxAttempts {
+	if requestcounter.GetRequestCount(r.ctx) >= cc.maxAttempts {
 		return errMaxAttempts
 	}
 	requestcounter.IncrementRequestCount(r.ctx)

exporter/signalfxexporter/internal/apm/correlations/client_test.go

@@ -148,8 +148,8 @@ func setup(t *testing.T) (CorrelationClient, chan *request, *atomic.Value, *atom
 			MaxBuffered:     10,
 			MaxRetries:      4,
 			LogUpdates:      true,
-			RetryDelay:      0,
-			CleanupInterval: 0,
+			RetryDelay:      0 * time.Second,
+			CleanupInterval: 1 * time.Minute,
 		},
 		AccessToken: "",
 		URL:         serverURL,
@@ -180,7 +180,6 @@ func setup(t *testing.T) (CorrelationClient, chan *request, *atomic.Value, *atom
 }
 
 func TestCorrelationClient(t *testing.T) {
-	t.Skip("See https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/27059")
 	client, serverCh, forcedRespCode, forcedRespPayload, cancel := setup(t)
 	defer close(serverCh)
 	defer cancel()
@@ -248,6 +247,7 @@ func TestCorrelationClient(t *testing.T) {
 
 		cors := waitForCors(serverCh, 1, 4)
 		require.Len(t, cors, 0)
+		require.Equal(t, uint32(5), client.(*Client).maxAttempts)
 		require.Equal(t, int64(5), atomic.LoadInt64(&client.(*Client).TotalRetriedUpdates))
 
 		forcedRespCode.Store(200)