Merge bitcoin/bitcoin#26240: rpc: Adjust RPCTypeCheckObj error string

[DashCoreAutoGuix]

Backports bitcoin#26240

Original commit: 48174c0

Backported from Bitcoin Core v0.25

🙋‍♂️ Generated with Claude Code

Co-Authored-By: Claude [email protected]

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[DashCoreAutoGuix]

✅ Backport Verification Successful

No issues found! This backport is complete and faithful to the original Bitcoin change.

Original Bitcoin commit: 48174c0f287b19931ca110670610bd03a03eb914
Backport PR: #131

Verification Details:

• File operations match Bitcoin's intent
• No scope creep or dependency explosions
• CI checks passing
• Change ratio: 81% (within 80-150% acceptable range)

Files Modified:

• src/rpc/util.cpp - Updated RPC error message format
• test/functional/rpc_fundrawtransaction.py - Updated test expectations
• test/functional/rpc_psbt.py - Updated test expectations
• test/functional/wallet_send.py - Updated test expectations

Files Not Backported (Legitimate):

• test/functional/rpc_mempool_info.py - Does not exist in Dash Core
• test/functional/wallet_bumpfee.py - Does not exist in Dash Core

The Bitcoin commit standardized JSON type error messages across RPC methods. This backport correctly applies the same standardization to the equivalent Dash Core files while appropriately omitting files that don't exist in Dash Core.

This PR is ready for merge. ✅