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/timedate/timedatectl.c

@@ -16,7 +16,6 @@
 #include "bus-print-properties.h"
 #include "bus-util.h"
 #include "constants.h"
-#include "env-util.h"
 #include "format-table.h"
 #include "in-addr-util.h"
 #include "log.h"