Add integration test for the /telemetry-ext endpoint (#2259)

## Changes
Followup from
https://github.com/databricks/cli/pull/2209#pullrequestreview-2580308075.

This PR adds an integration test to validate that the API type bindings
work against the telemetry endpoint.

## Tests
N/A

---------

Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>

integration/libs/telemetry/telemetry_test.go

@@ -0,0 +1,65 @@
+package telemetry
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/databricks/cli/integration/internal/acc"
+	"github.com/databricks/cli/libs/telemetry"
+	"github.com/databricks/cli/libs/telemetry/protos"
+	"github.com/databricks/databricks-sdk-go/client"
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTelemetryEndpoint(t *testing.T) {
+	ctx, wt := acc.WorkspaceTest(t)
+	w := wt.W
+
+	apiClient, err := client.New(w.Config)
+	require.NoError(t, err)
+
+	logs := []protos.FrontendLog{
+		{
+			FrontendLogEventID: uuid.New().String(),
+			Entry: protos.FrontendLogEntry{
+				DatabricksCliLog: protos.DatabricksCliLog{
+					CliTestEvent: &protos.CliTestEvent{Name: protos.DummyCliEnumValue1},
+				},
+			},
+		},
+		{
+			FrontendLogEventID: uuid.New().String(),
+			Entry: protos.FrontendLogEntry{
+				DatabricksCliLog: protos.DatabricksCliLog{
+					CliTestEvent: &protos.CliTestEvent{Name: protos.DummyCliEnumValue2},
+				},
+			},
+		},
+	}
+
+	protoLogs := make([]string, len(logs))
+	for i, log := range logs {
+		b, err := json.Marshal(log)
+		require.NoError(t, err)
+		protoLogs[i] = string(b)
+	}
+
+	reqB := telemetry.RequestBody{
+		UploadTime: time.Now().UnixMilli(),
+		Items:      []string{},
+		ProtoLogs:  protoLogs,
+	}
+
+	respB := telemetry.ResponseBody{}
+
+	err = apiClient.Do(ctx, "POST", "/telemetry-ext", nil, nil, reqB, &respB)
+	require.NoError(t, err)
+
+	assert.Equal(t, telemetry.ResponseBody{
+		Errors:          []telemetry.LogError{},
+		NumProtoSuccess: int64(2),
+	}, respB)
+}