bug#80837: treesit-forward-comment off-by-one issue: overshoots by one character

>> I'm very sorry to reopen it, but we still have the same problem
>> in the emacs-31 release branch.  For example, try in c-ts-mode to
>> uncomment a comment, and it leaves the trailing */ comment endings.
>
> I'm not sure this is important enough to block the release, but we can
> at least discuss whether we think there is a possible small,
> non-invasive for the emacs-31 branch.  Yuan, sorry to go back and forth
> so many times here, but do you think there is a way to do it less
> invasively?

Leaving emacs-31 unfixed makes c-ts-mode somewhat unusable
since uncommenting is a frequent operation.  If a small fix
for treesit-forward-comment is still unfeasible, then at least
we need to disable the 'comment' thing for c-ts-mode
in the release branch:

diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 5f064716a89..3efbee6f8a7 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -1275,8 +1275,7 @@ c-ts-mode--thing-settings
                     "goto_statement"
                     "case_statement")))
     (text ,(regexp-opt '("comment"
-                         "raw_string_literal")))
-    (comment "comment"))
+                         "raw_string_literal"))))
   "`treesit-thing-settings' for both C and C++.")
 
 ;;; Support for FOR_EACH_* macros