Use <script type="py"> instead of <py-script> in most tests (#1723)

This is mostly a global search&replace, to replace <py-script> with <script type="py">.

The vast majority of tests just works, some needed some tweak.

pyscript.core/tests/integration/test_shadow_root.py

@@ -24,10 +24,10 @@ class TestShadowRoot(PyScriptTest):
                 });
             </script>
             <s-r></s-r>
-            <py-script>
+            <script type="py">
                 import js
                 js.console.log(Element("shadowed").innerHtml)
-            </py-script>
+            </script>
             """
         )
         assert self.console.log.lines[-1] == "OK"