Do not call custom-reevaluate-setting in comint.el (bug#74287)

Do not call custom-reevaluate-setting in comint.el (bug#74287)

* lisp/comint.el (comint--force-history-isearch): New internal variable.
(comint-history-isearch-backward, comint-history-isearch-backward-regexp):
Set comint--force-history-isearch to t.
(comint-history-isearch-setup): Check comint--force-history-isearch.
(comint-history-isearch-end): Set comint--force-history-isearch back to nil
instead of calling custom-reevaluate-setting.

(cherry picked from commit 5db9471453af4a47d7665295ea007faf35c069b6)