Mm 16623 fix all initialism errors in channels/app and channels/api4 dir (#25743)

* updated go mod and sum files

* fixed var-naming errors in channels/app and channels/api4 dir

* Revert "updated go mod and sum files"

This reverts commit 088dd00a848c2c31952c29f0a2a28a9fb47fc3f7.

* renamed a cost .

server/channels/api4/user_test.go

@@ -2469,7 +2469,7 @@ func TestUpdateUserActive(t *testing.T) {
 		require.Error(t, err)
 		CheckForbiddenStatus(t, resp)
 
-		resp, err = th.Client.UpdateUserActive(context.Background(), GenerateTestId(), true)
+		resp, err = th.Client.UpdateUserActive(context.Background(), GenerateTestID(), true)
 		require.Error(t, err)
 		CheckForbiddenStatus(t, resp)
 
@@ -3672,7 +3672,7 @@ func TestVerifyUserEmail(t *testing.T) {
 	_, err = th.Client.VerifyUserEmail(context.Background(), token.Token)
 	require.NoError(t, err)
 
-	resp, err := th.Client.VerifyUserEmail(context.Background(), GenerateTestId())
+	resp, err := th.Client.VerifyUserEmail(context.Background(), GenerateTestID())
 	require.Error(t, err)
 	CheckBadRequestStatus(t, resp)