patch 9.1.1625: Autocompletion slow with include- and tag-completion

Problem:  Autocompletion slow with include- and tag-completion
Solution: Refactor ins_compl_interrupted() to also check for timeout,
          further refactor code to skip outputting message when
          performing autocompletion (Girish Palya).

Running `vim *` in `vim/src` was slower than expected when
'autocomplete' was enabled. Include-file and tag-file completion
sources were not subject to the timeout check, causing unnecessary
delays.

So apply the timeout check to these sources as well, improving
autocompletion responsiveness, refactor find_pattern_in_path() to take
an additional "silent" argument, to suppress any messages.

closes: #17966

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/normal.c

@@ -4478,7 +4478,7 @@ nv_brackets(cmdarg_T *cap)
 			    SAFE_islower(cap->nchar) ? ACTION_SHOW : ACTION_GOTO,
 		cap->cmdchar == ']' ? curwin->w_cursor.lnum + 1 : (linenr_T)1,
 		(linenr_T)MAXLNUM,
-		FALSE);
+		FALSE, FALSE);
 	    vim_free(ptr);
 	    curwin->w_set_curswant = TRUE;
 	}