fix(bb-sol): commit Debug.sol in forge-fmt-stable form on next (AztecProtocol#23168)

## Summary

Companion to AztecProtocol#23146
(merge-train/barretenberg), recreated against `next`.

`barretenberg/sol/bootstrap.sh::build_sol` runs `forge fmt` before
`forge build`. PR AztecProtocol#22659 (now in `next` via merge-train/fairies) trimmed
unused imports from `test/utils/Debug.sol`; once trimmed, the multi-line
import block was short enough that `forge fmt` collapses it to a single
line. That rewrites the file mid-CI and trips `ci3/cache_content_hash`
with `ERROR: Noticed changes to rebuild patterns during CI run`,
disabling cache hits for every downstream `*-tests` target — as seen in
http://ci.aztec-labs.com/1778494208886637.

This PR puts `Debug.sol` directly into the forge-fmt-stable form
(single-line import). After rebase, this is the only diff against
`next`.

## Verification

```bash
cd barretenberg/sol
forge fmt --check    # clean
forge fmt            # no changes
```

Full analysis:
https://gist.github.com/AztecBot/86bb7e59c1a9998f77dd1bc51dd9319d

Author: alexghr

barretenberg/sol/test/utils/Debug.sol

@@ -3,11 +3,7 @@
 pragma solidity >=0.8.27;
 
 import {Fr} from "src/honk/Fr.sol";
-import {
-    Honk,
-    NUMBER_OF_ALPHAS,
-    CONST_PROOF_SIZE_LOG_N
-} from "src/honk/HonkTypes.sol";
+import {Honk, NUMBER_OF_ALPHAS, CONST_PROOF_SIZE_LOG_N} from "src/honk/HonkTypes.sol";
 import {Transcript} from "src/honk/Transcript.sol";
 
 function bytes32ToString(bytes32 value) pure returns (string memory result) {