Ensure unique ROB IDs in L1TriggerByteStreamDecoderAlg

Simply add two lines to ensure the list of retrieved ROB IDs is unique:

std::sort(m_robIds.begin(),m_robIds.end());
m_robIds.erase(std::unique(m_robIds.begin(),m_robIds.end()), m_robIds.end());

which fixes ATR-26041.

The other changes in this MR only facilitate testing and debugging this issue, namely:

• add option to decode jFex xTOBs in the test script
• print the list of ROB IDs in L1TriggerByteStreamDecoderAlg::initialize()