ci: Enable IWYU in src/kernel directory

Suggested bitcoin#25308 (comment)

Author: ryanofsky

ci/test/06_script_b.sh

@@ -42,7 +42,7 @@ if [ "${RUN_TIDY}" = "true" ]; then
           " src/compat"\
           " src/dbwrapper.cpp"\
           " src/init"\
-          " src/kernel/mempool_persist.cpp"\
+          " src/kernel"\
           " src/node/chainstate.cpp"\
           " src/policy/feerate.cpp"\
           " src/policy/packages.cpp"\

src/kernel/checks.cpp

@@ -9,6 +9,8 @@
 #include <util/time.h>
 #include <util/translation.h>
 
+#include <memory>
+
 namespace kernel {
 
 std::optional<bilingual_str> SanityChecks(const Context&)

src/kernel/coinstats.cpp

@@ -4,16 +4,32 @@
 
 #include <kernel/coinstats.h>
 
+#include <chain.h>
 #include <coins.h>
 #include <crypto/muhash.h>
 #include <hash.h>
+#include <node/blockstorage.h>
+#include <primitives/transaction.h>
+#include <script/script.h>
 #include <serialize.h>
+#include <span.h>
+#include <streams.h>
+#include <sync.h>
+#include <tinyformat.h>
 #include <uint256.h>
+#include <util/check.h>
 #include <util/overflow.h>
 #include <util/system.h>
 #include <validation.h>
+#include <version.h>
 
+#include <cassert>
+#include <iosfwd>
+#include <iterator>
 #include <map>
+#include <memory>
+#include <string>
+#include <utility>
 
 namespace kernel {
 

src/kernel/coinstats.h

@@ -5,16 +5,18 @@
 #ifndef BITCOIN_KERNEL_COINSTATS_H
 #define BITCOIN_KERNEL_COINSTATS_H
 
-#include <chain.h>
-#include <coins.h>
 #include <consensus/amount.h>
 #include <streams.h>
 #include <uint256.h>
 
 #include <cstdint>
 #include <functional>
+#include <optional>
 
 class CCoinsView;
+class Coin;
+class COutPoint;
+class CScript;
 namespace node {
 class BlockManager;
 } // namespace node