Merge bitcoin/bitcoin#34352: ci, iwyu: Fix warnings in src/primitives and treat them as errors

fdc9fe2da6 ci, iwyu: Fix warnings in `src/primitives` and treat them as errors (Hennadii Stepanov)

Pull request description:

  This PR [continues](https://github.com/bitcoin/bitcoin/pull/33725#issuecomment-3466897433) the ongoing effort to enforce IWYU warnings.

  See [Developer Notes](https://github.com/bitcoin/bitcoin/blob/master/doc/developer-notes.md#using-iwyu).

ACKs for top commit:
  maflcko:
    review ACK fdc9fe2da6 📀
  janb84:
    ACK fdc9fe2da6
  sedited:
    ACK fdc9fe2da6

Tree-SHA512: d290545c7aab477b4a5bf121b694899a78e0526be72efa31fa4205b0fd840e6e8240d32f9134a18c9dc58c5f91e7847d7f20ca34f8d2edc4d541ac858ec0dccc

ci/test/03_test_script.sh

@@ -215,7 +215,7 @@ fi
 
 if [[ "${RUN_IWYU}" == true ]]; then
   # TODO: Consider enforcing IWYU across the entire codebase.
-  FILES_WITH_ENFORCED_IWYU="/src/((crypto|index|kernel)/.*\\.cpp|node/blockstorage.cpp|node/utxo_snapshot.cpp|core_io.cpp|signet.cpp)"
+  FILES_WITH_ENFORCED_IWYU="/src/((crypto|index|kernel|primitives)/.*\\.cpp|node/blockstorage.cpp|node/utxo_snapshot.cpp|core_io.cpp|signet.cpp)"
   jq --arg patterns "$FILES_WITH_ENFORCED_IWYU" 'map(select(.file | test($patterns)))' "${BASE_BUILD_DIR}/compile_commands.json" > "${BASE_BUILD_DIR}/compile_commands_iwyu_errors.json"
   jq --arg patterns "$FILES_WITH_ENFORCED_IWYU" 'map(select(.file | test($patterns) | not))' "${BASE_BUILD_DIR}/compile_commands.json" > "${BASE_BUILD_DIR}/compile_commands_iwyu_warnings.json"
 
@@ -227,6 +227,7 @@ if [[ "${RUN_IWYU}" == true ]]; then
              -p "${BASE_BUILD_DIR}" "${MAKEJOBS}" \
              -- -Xiwyu --cxx17ns -Xiwyu --mapping_file="${BASE_ROOT_DIR}/contrib/devtools/iwyu/bitcoin.core.imp" \
              -Xiwyu --max_line_length=160 \
+             -Xiwyu --check_also="*/primitives/*.h" \
              2>&1 | tee /tmp/iwyu_ci.out
     python3 "/include-what-you-use/fix_includes.py" --nosafe_headers < /tmp/iwyu_ci.out
     git diff -U0 | ./contrib/devtools/clang-format-diff.py -binary="clang-format-${TIDY_LLVM_V}" -p1 -i -v