clang-tidy: Fix all remaining misc-include-cleaner violations

- Remove unused includes
- Add common false positive headers to misc-include-cleaner.IgnoreHeaders
- Add IWYU pragma keep for uncommon false positive headers

src/test/test-capability-list.c

@@ -5,7 +5,6 @@
 #include "alloc-util.h"
 #include "capability-list.h"
 #include "capability-util.h"
-#include "parse-util.h"
 #include "random-util.h"
 #include "string-util.h"
 #include "strv.h"