Drop tests that break with newer oauth2

The bazel test failures are caused by (oauth2: turn Transport.CancelRequest into a no-op)[golang/oauth2@858c2ad]:
golang/oauth2@0f29369...858c2ad

Signed-off-by: Davanum Srinivas <[email protected]>

Author: dims

staging/src/k8s.io/client-go/transport/token_source_test.go

@@ -176,17 +176,6 @@ func TestCancellation(t *testing.T) {
 			header:       map[string][]string{"Authorization": {"Bearer TOKEN"}},
 			expectCancel: true,
 		},
-		{
-			name:         "cancel req without bearer token hits both rts",
-			expectCancel: true,
-		},
-		{
-			name: "cancel req without bearer token hits both wrapped rts",
-			wrapTransport: func(rt http.RoundTripper) http.RoundTripper {
-				return NewUserAgentRoundTripper("testing testing", rt)
-			},
-			expectCancel: true,
-		},
 		{
 			name: "can't cancel request with rts that doesn't implent unwrap or cancel",
 			wrapTransport: func(rt http.RoundTripper) http.RoundTripper {