fix: restore testing framework to actually work (#2070)

after refactor to some new asynchronous items for finders,
the tests stopped actually doing anything.

now they do things again.

scripts/minimal_init.vim

@@ -5,3 +5,5 @@ set rtp+=../tree-sitter-lua/
 runtime! plugin/plenary.vim
 runtime! plugin/telescope.lua
 runtime! plugin/ts_lua.vim
+
+let g:telescope_test_delay = 100