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43cd83b0c7test: move uint256_tests/operator_with_self to arith_uint256_tests (stickies-v)c6c994cb2btest: remove test-only uint160S (stickies-v)62cc4656e2test: remove test-only uint256S (stickies-v)adc00ad728test: remove test-only arith_uint256S (stickies-v)f51b237723refactor: rpc: use uint256::FromHex for ParseHashV (stickies-v) Pull request description: _Continuation of #30569._ Sincefad2991ba0, `uint256S()` has been [deprecated](fad2991ba0 (diff-800776e2dda39116e889839f69409571a5d397de048a141da7e4003bc099e3e2R138)) because it is less robust than the `base_blob::FromHex()` introduced in https://github.com/bitcoin/bitcoin/pull/30482. Specifically, it tries to recover from length-mismatches, recover from untrimmed whitespace, 0x-prefix and garbage at the end, instead of simply requiring exactly 64 hex-only characters. (see also https://github.com/bitcoin/bitcoin/pull/30532) This PR removes `uint256S()` (and `uint160S()`) completely, with no non-test behaviour change. Specifically, the main changes in this PR are: - the (minimal) last non-test usage of `uint256S()` in `ParseHashV()` is removed without behaviour change, which can partially be verified by cherry-picking and/or modifying [this test commit](1f2b0fa86d)). - the test usage of `uint{160,256}S()` is removed, largely replacing it with `uint{160,256}::FromHex()` where applicable, potentially modifying the test by removing non-hex characters or dropping the test entirely if removing non-hex characters makes it redundant - the now unused `uint{160,256}S()` functions are removed completely. - unit test coverage on converting `uint256` <-> `arith_uint256` through `UintToArith256()` and `ArithToUint256()` is beefed up, and `arith_uint256` tests are moved to `arith_uint256_tests.cpp`, removing the `uint256_tests.cpp` dependency on `uint256h`, mirroring how the code is structured. _Note: `uint256::FromUserHex()` exists to more leniently construct uint256 from user input, allowing "0x" prefixes and too-short-input, as safer alternative to `uint256S()` where necessary._ ACKs for top commit: l0rinc: reACK43cd83b0c7hodlinator: re-ACK43cd83b0c7ryanofsky: Code review ACK43cd83b0c7. Only code change is a small refactoring which looks good. The rest of the PR is all test changes, which I only lightly reviewed, but seem to be positive and do what's described Tree-SHA512: 48147a4c6af671597df0f72c1b477ae4631cd2cae4645ec54d0e327611ff302c9899e344518c81242cdde82930f6ad23a3a7e6e0b80671816e9f457b9de90a5c