DEV: Use recorded runtime log for plugin specs (#28711)

The recorded runtime log was specified when running the plugin specs,
but it failed to match the entries from the runtime log and the passed
as command line arguments because the runtime log entries were not
prefixed with `./`.

lib/tasks/plugin.rake

@@ -193,7 +193,7 @@ def spec(plugin, parallel: false, argv: nil)
 
   # reject system specs as they are slow and need dedicated setup
   files =
-    Dir.glob("./plugins/#{plugin}/spec/**/*_spec.rb").reject { |f| f.include?("spec/system/") }.sort
+    Dir.glob("plugins/#{plugin}/spec/**/*_spec.rb").reject { |f| f.include?("spec/system/") }.sort
 
   if files.length > 0
     cmd = parallel ? "bin/turbo_rspec" : "bin/rspec"