Do not persist REPORTED status when the main-table transfer fails

[vikrantwiz02]

Summary

• update_student_status saved reported_status = REPORTED unconditionally before attempting the ExtraInfo/Student/User transfer, so any failure in that transfer (batch not found, or any other exception) left the status permanently stuck at REPORTED with nothing actually transferred
• Since the transfer only runs when old_status != REPORTED, a stuck REPORTED status also silently disabled all future retries for that student
• Reverts reported_status back to old_status on every failure path in that block, and the response now reports success:false with an honest message when the transfer didn't complete
• Applies uniformly to UG, PG and PhD since they share this same function

Test plan

• Python syntax check passes
• Traced all failure paths in the REPORTED-transfer branch (2 explicit BATCH_NOT_FOUND early returns + the catch-all exception handler)