Investigate addition of DrainAndServiceIO to TestReadInteraction

[mrjerryjohns]

Problem

As part of #17426, I had to add an extra DrainAndServiceIO call to TestReadInteraction. While the changes to ReadHandler in that PR may look substantial, the smallest delta to that PR that triggered the addition above was to add the following in ReadHandler.cpp:

        else if (IsType(InteractionType::Subscribe))
        {
            if (IsPriming())
            {
                err = SendSubscribeResponse();

                mpExchangeCtx = nullptr;
                SuccessOrExit(err);

                mActiveSubscription = true;

                auto * appCallback = mManagementCallback.GetAppCallback();
                if (appCallback)
                {
                    appCallback->OnSubscriptionEstablished(*this);
                }
            }
            else
            {
                MoveToState(HandlerState::GeneratingReports);
                mpExchangeCtx = nullptr;
            }

            //
            // This is the line if added, causes the test to fail.
            SuccessOrExit(err = InteractionModelEngine::GetInstance()->GetReportingEngine().ScheduleRun());
        }

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale]

This stale issue has been automatically closed. Thank you for your contributions.