patch 9.1.1077: included syntax items do not understand contains=TOP

patch 9.1.1077: included syntax items do not understand contains=TOP

Problem:  Syntax engine interpreted contains=TOP as matching nothing
          inside included files, since :syn-include forces HL_CONTAINED
          on for every included item. After 8.2.2761, interprets
          contains=TOP as contains=@INCLUDED, which is also not correct
          since it doesn't respect exclusions, and doesn't work if there
          is no @INCLUDED cluster.
Solution: revert patch 8.2.2761, instead track groups that have had
          HL_CONTAINED forced, and interpret contains=TOP and
          contains=CONTAINED using this. (Theodore Dubois)

fixes: #11277
closes: #16571

Signed-off-by: Theodore Dubois <tblodt@icloud.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>