Improve Trigger ByteStream I/O python configuration (ComponentAccumulator)

A few related improvements:

• Reduce code duplication by moving a common block from a few configuration functions to a single one in new module TriggerByteStreamConfig
• Declare ByteStreamMetadata dependency explicitly in TriggerConfig.py, fixes part of ATR-23459
• Remove a hack using old-JO svcMgr in a new-JO function triggerOutputCfg as a CA solution is now possible