chore: Enable clang-tidy include cleaner (#6947)

src/test/jtx/impl/flags.cpp

@@ -1,7 +1,14 @@
 #include <test/jtx/flags.h>
 
+#include <test/jtx/Account.h>
+#include <test/jtx/Env.h>
+
+#include <xrpl/json/json_value.h>
+#include <xrpl/protocol/SField.h>
 #include <xrpl/protocol/jss.h>
 
+#include <cstdint>
+
 namespace xrpl {
 namespace test {
 namespace jtx {