Support list-matching-lines-jump-to-current-line for context lines.

Support list-matching-lines-jump-to-current-line for context lines.

* lisp/replace.el (occur--orig-line-str): Remove.
(occur): Remove occur--orig-line-str.
(occur-engine): Use add-face-text-property to add the face
list-matching-lines-current-line-face to the current line.
Use previous-single-property-change to find occur--final-pos.
(occur-context-lines): New args orig-line and multi-occur-p.
Find the current line in context lines and add face to it.
(Bug#30281)