Wire up tests to support otel tracing

Integration tests will now configure clients to propagate traces as well
as create spans for all tests.

Some extra changes were needed (or desired for trace propagation) in the
test helpers to pass through tracing spans via context.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

integration-cli/docker_cli_save_load_unix_test.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/creack/pty"
 	"github.com/docker/docker/integration-cli/cli/build"
+	"github.com/docker/docker/testutil"
 	"gotest.tools/v3/assert"
 	"gotest.tools/v3/icmd"
 )
@@ -90,7 +91,7 @@ func (s *DockerCLISaveLoadSuite) TestSaveAndLoadWithProgressBar(c *testing.T) {
 func (s *DockerCLISaveLoadSuite) TestLoadNoStdinFail(c *testing.T) {
 	pty, tty, err := pty.Open()
 	assert.NilError(c, err)
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	ctx, cancel := context.WithTimeout(testutil.GetContext(c), 5*time.Second)
 	defer cancel()
 	cmd := exec.CommandContext(ctx, dockerBinary, "load")
 	cmd.Stdin = tty