perf: automatically suspend the scheduler when all threads are waiting (#1591)

* perf: automatically suspend the scheduler when all threads are waiting

* ci: fix ci

* test: cleanup

tests/core/init_spec.lua

@@ -1,4 +1,3 @@
----@module 'luassert'
 local Util = require("lazy.core.util")
 
 describe("init", function()

tests/core/plugin_spec.lua

@@ -1,5 +1,3 @@
----@module 'luassert'
-
 local Config = require("lazy.core.config")
 local Handler = require("lazy.core.handler")
 local Plugin = require("lazy.core.plugin")