fix(vim): add busted globals to the lua diagnostics lsp

When writing tests with busted they use some other globals that you need
to tell you lsp about. I already have this for when I'm working on the
nvim config and configz.

site-modules/core/files/vim/plugin/lsp.lua

@@ -27,7 +27,7 @@ local servers = {
       Lua = {
         telemetry = { enable = false },
         runtime = { version = "LuaJIT" },
-        diagnostics = { globals = { "vim", "configz" } },
+        diagnostics = { globals = { "vim", "configz", "describe", "it", "assert", "spy" } },
         workspace = {
           library = workspace_library,
           checkThirdParty = false,