fix: Remove "Printing" (and related) from listdatastore debug log.

[s373nZ]

I'm noticing a lot of entries in the debug log as such:

439Z DEBUG lightningd: Printing

There doesn't seem to be any other helpful information. Assumption is that this was a debugging exercise that wasn't fully removed, but I could be wrong. This PR removes that line in the listdatastore RPC.

Changelog-None

Important

25.12 FREEZE October 27th: Non-bugfix PRs not ready by this date will wait for 26.03.

RC1 is scheduled on November 10th

The final release is scheduled for December 1st.

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[s373nZ]

A closer look at this function shows a few other debug log entries including:

• Looking for:
• Got: (which does appear in my logs)
• Too long

Maybe these should all be removed as well, but I'm lacking context.

[s373nZ]

Removed the additional debug logging statements described in #8548 (comment).