selectrum: fix bugs when counsel is loaded (hack)

some doom functions check the completion module with `fboundp`'s instead
of `featurep!`, and counsel can be loaded by using e.g. `lispy`. we add
temporary fixes for this by checking for selectrum stuff first, but this
should be given a more robust fix later on

also we document the selectrum PR's hacks in the TODO.org

see discussion on #5013

core/autoload/projects.el

@@ -128,6 +128,8 @@ If DIR is not a project, it will be indexed (but not cached)."
             (if (doom-module-p :completion 'ivy)
                 #'counsel-projectile-find-file
               #'projectile-find-file)))
+          ((fboundp 'selectrum-mode) ;HACK see @ymarco's comment on #5013 and TODO.org in the selecturm module.
+           (call-interactively #'find-file))
           ((fboundp 'counsel-file-jump) ; ivy only
            (call-interactively #'counsel-file-jump))
           ((project-current nil dir)