Fix part_of targets and remove epitrochlear lymph node in HRA lymph template

Address zhengj2007's review feedback on #3718:

Resolved UNRESOLVABLE part_of values for 6 terms:
- UBERON_8930108 (anterior lymph trunk of accompanying suprarenal vein) → part_of UBERON:0002369 (adrenal gland)
- UBERON_8930110 (collecting lymph trunk of lymphatics of soft parts covering posterior thoracic wall) → part_of UBERON:0016403 (thoracic wall)
- UBERON_8930123 (left lateral aortic lymph node) → part_of UBERON:0001516 (abdominal aorta)
- UBERON_8930135 (posterior extrathoracic lymph node) → part_of UBERON:0016403 (thoracic wall)
- UBERON_8930141 (right lateral aortic lymph node) → part_of UBERON:0001516 (abdominal aorta)
- UBERON_8930144 (subclavicular lymph node) → part_of UBERON:0035168 (infraclavicular region)

Refined imprecise part_of values:
- UBERON_8930113 (deep radial lymphatic channel): UBERON:0007302 (pectoral appendage vasculature) → UBERON:0002386 (forelimb zeugopod / forearm), consistent with sibling forearm lymphatic channels
- UBERON_8930121 (left anterior mediastinal lymph node): UBERON:0003728 (mediastinum) → UBERON:0008820 (anterior mediastinum), matching UBERON_8930139 (right anterior mediastinal lymph node)

Removed FMA:12775 xref from UBERON_8930121 and UBERON_8930124 (avoid duplicate xref).

Removed new term UBERON_8930117 (epitrochlear lymph node) per reviewer request.

Signed-off-by: @dragon-ai-agent

Author: github-actions[bot]