Move and rename test_custom_js_settings. NFC (#22463)

- Move test to `other` suite
- Group with other `js_lib` tests
- Name test file to match test name

Author: sbc100

test/core/test_custom_js_settings.c renamed to test/other/test_js_lib_custom_settings.c

@@ -9493,15 +9493,6 @@ def test_export_start(self):
   def test_emscripten_math(self):
     self.do_core_test('test_emscripten_math.c')
 
-  # Tests that users can pass custom JS options from command line using
-  # the -jsDfoo=val syntax:
-  # See https://github.com/emscripten-core/emscripten/issues/10580.
-  def test_custom_js_options(self):
-    self.emcc_args += ['--js-library', test_file('core/test_custom_js_settings.js'), '-jsDCUSTOM_JS_OPTION=1']
-    self.do_core_test('test_custom_js_settings.c')
-
-    self.assertContained('cannot change built-in settings values with a -jsD directive', self.expect_fail([EMCC, '-jsDWASM=0']))
-
   # Tests <emscripten/stack.h> API
   @no_asan('stack allocation sizes are no longer predictable')
   def test_emscripten_stack(self):

test/core/test_custom_js_settings.out renamed to test/other/test_js_lib_custom_settings.out

@@ -4695,6 +4695,15 @@ def test_js_lib_legacy(self):
 ''')
     self.do_runf('src.c', 'main: 42\n', emcc_args=['--js-library', 'lib.js'])
 
+  # Tests that users can pass custom JS options from command line using
+  # the -jsDfoo=val syntax:
+  # See https://github.com/emscripten-core/emscripten/issues/10580.
+  def test_js_lib_custom_settings(self):
+    self.emcc_args += ['--js-library', test_file('core/test_custom_js_settings.js'), '-jsDCUSTOM_JS_OPTION=1']
+    self.do_other_test('test_js_lib_custom_settings.c')
+
+    self.assertContained('cannot change built-in settings values with a -jsD directive', self.expect_fail([EMCC, '-jsDWASM=0']))
+
   def test_EMCC_BUILD_DIR(self):
     # EMCC_BUILD_DIR env var contains the dir we were building in, when running the js compiler (e.g. when
     # running a js library). We force the cwd to be src/ for technical reasons, so this lets you find out