Handle calling read-char-from-minibuffer and y-or-n-p from pre-command-hook

Handle calling read-char-from-minibuffer and y-or-n-p from pre-command-hook

* lisp/subr.el (read-char-from-minibuffer-insert-char)
(read-char-from-minibuffer-insert-other, y-or-n-p-insert-y)
(y-or-n-p-insert-n, y-or-n-p-insert-other):
Check for 'minibufferp' before executing the body.
(read-char-from-minibuffer, y-or-n-p): Let-bind this-command
before calling read-from-minibuffer.  (Bug#45029)