chore(idkg): update ID generator's height together with the transcripts' references

[pierugo-dfinity]

This PR moves the ID generator's height update inside the payload's update_refs function, which does the same thing for all transcript references. I do not think there is a good reason to update one but not the others, so it is less error-prone to update everything together in the same function.

Also, adds a unit test ensuring these references are actually updated when building a summary payload.

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to c46bde9.

Security Overview

• 🔎 Scanned files: 2 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/f5e9d2bb-29a4-4b64-902a-391d65fd8b2d?scanId=3903909c-83e1-42e8-af68-fbd8501e342f&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Bug Fix	► rs/consensus/idkg/src/payload_builder.rs     Fix update_refs call order and UID height update in create_summary_payload_helper and update_summary_refs ► rs/types/types/src/consensus/idkg.rs     Adjust update_refs to return Result and propagate UID update, then apply to key_transcripts