test(no-unused-class-name): added a test with pseudo-classes

Author: marekdedic

tests/fixtures/rules/no-unused-class-name/valid/pseudo-classes01-input.svelte

@@ -0,0 +1,14 @@
+<div class="div-class">Hello</div>
+
+<span class="span-class-one">World</span>
+
+<span class="span-class-two">!</span>
+
+<style>
+  :not(.div-class) {
+    color: red;
+  }
+  :is(.span-class-one, .span-class-two) {
+    color: red;
+  }
+</style>