patch 9.1.0994: Vim9: not able to use comment after opening curly brace

patch 9.1.0994: Vim9: not able to use comment after opening curly brace

Problem:  Vim9: not able to use comment after opening curly brace
          (lifepillar)
Solution: allow to use comments after curly braces of an inner-block,
          modify the logic to search for comment in a line, update Vim9
          tests to use specific class type instead of any
          (Yegappan Lakshmanan)

fixes: #16363
closes: #16405

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>