core: Clean up includes

Split out of #37344.

src/core/execute-serialize.c

@@ -3,23 +3,31 @@
 #include "af-list.h"
 #include "capability-util.h"
 #include "cgroup.h"
-#include "cgroup-setup.h"
+#include "dissect-image.h"
 #include "dynamic-user.h"
 #include "escape.h"
 #include "exec-credential.h"
+#include "execute.h"
 #include "execute-serialize.h"
+#include "extract-word.h"
 #include "fd-util.h"
-#include "fileio.h"
 #include "hexdecoct.h"
+#include "image-policy.h"
 #include "in-addr-prefix-util.h"
+#include "log.h"
+#include "nsflags.h"
+#include "open-file.h"
+#include "ordered-set.h"
 #include "parse-helpers.h"
 #include "parse-util.h"
-#include "percent-util.h"
+#include "path-util.h"
 #include "process-util.h"
 #include "rlimit-util.h"
 #include "serialize.h"
+#include "set.h"
 #include "string-util.h"
 #include "strv.h"
+#include "time-util.h"
 
 static int exec_cgroup_context_serialize(const CGroupContext *c, FILE *f) {
         _cleanup_free_ char *disable_controllers_str = NULL, *delegate_controllers_str = NULL,