Replace anonymous lambda timers with named functions

Replace anonymous lambda timers with named functions

* lisp/emacs-lisp/eldoc.el (eldoc--update, eldoc-schedule-timer):
* lisp/jit-lock.el (jit-lock-context--update)
(jit-lock--antiblink-update): New functions broken out from...
* lisp/emacs-lisp/eldoc.el (eldoc-schedule-timer):
* lisp/jit-lock.el (jit-lock-mode, jit-lock--antiblink-post-command):
...here.  Use them as values for timers, to give them readable names
in 'M-x list-timers'.  (Bug#71354)

(cherry picked from commit ec517d1dcf3260b2cf1684566b5e3bf3979eaceb)