tests: Stop bundling "perf" tests with gnome-shell

Now that scripts are loaded as external modules, there's no reason
anymore for bundling them with the gnome-shell executable. Just
move the scripts into a dedicated folder in tests/ and run them
from there.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2812>

js/js-resources.gresource.xml

@@ -35,12 +35,6 @@
     <file>misc/util.js</file>
     <file>misc/weather.js</file>
 
-    <file>perf/basic.js</file>
-    <file>perf/closeWithActiveWindows.js</file>
-    <file>perf/core.js</file>
-    <file>perf/headlessStart.js</file>
-    <file>perf/hwtest.js</file>
-
     <file>ui/accessDialog.js</file>
     <file>ui/altTab.js</file>
     <file>ui/animation.js</file>

tests/meson.build

@@ -72,7 +72,7 @@ foreach shell_test : shell_tests
       test_tool,
       '--headless',
       options,
-      '@0@/js/perf/@1@.js'.format(meson.project_source_root(), test_name),
+      '@0@/shell/@1@.js'.format(meson.current_source_dir(), test_name),
     ],
     is_parallel: false,
     env: shell_testenv,