Fix data race in tests

tool/tsh/tsh_test.go

@@ -1856,7 +1856,7 @@ func TestAccessRequestOnLeaf(t *testing.T) {
 		"--proxy", rootProxyAddr.String(),
 		"leafcluster",
 	}, setHomePath(tmpHomePath))
-	require.Error(t, err)
+	require.NoError(t, err)
 
 	err = Run(ctx, []string{
 		"login",
@@ -2067,7 +2067,7 @@ iUK/veLmZ6XoouiWLCdU1VJz/1Fcwe/IEamg6ETfofvsqOCgcNYJ
 
 		errChan := make(chan error)
 		runCreds := func() {
-			err = Run(ctx, []string{
+			credErr := Run(context.Background(), []string{
 				"kube",
 				"credentials",
 				"--insecure",
@@ -2079,7 +2079,7 @@ iUK/veLmZ6XoouiWLCdU1VJz/1Fcwe/IEamg6ETfofvsqOCgcNYJ
 				cf.mockSSOLogin = ssoFunc
 				return nil
 			})
-			errChan <- err
+			errChan <- credErr
 		}
 
 		// Run kube credentials calls in parallel, only one should actually call SSO login
@@ -2205,7 +2205,6 @@ func TestSSHHeadless(t *testing.T) {
 		cf.mockHeadlessLogin = mockHeadlessLogin(t, rootAuth.GetAuthServer(), alice)
 		return nil
 	}))
-
 	require.Error(t, err)
 	require.ErrorIs(t, err, trace.BadParameter("user must be set explicitly for headless login with the --user flag or $TELEPORT_USER env variable"))
 }