[3.15] gh-124111: Keep tests passing for Tcl prior to 9.0 (GH-150102)

Also disables the UWP build in CI, since it was breaking (and is no longer released).
(cherry picked from commit ec9ce3e)

Co-authored-by: Steve Dower <steve.dower@python.org>

Author: miss-islington

.github/workflows/reusable-windows.yml

@@ -22,8 +22,6 @@ permissions:
 
 env:
   FORCE_COLOR: 1
-  IncludeUwp: >-
-    true
 
 jobs:
   build:

Lib/test/test_tcl.py

@@ -55,7 +55,7 @@ def test_eval_null_in_result(self):
     def test_eval_surrogates_in_result(self):
         tcl = self.interp
         result = tcl.eval(r'set a "<\ud83d\udcbb>"')
-        if sys.platform == 'win32':
+        if sys.platform == 'win32' and tcl_version >= (9, 0):
             self.assertEqual('<\ud83d\udcbb>', result)
         else:
             self.assertEqual('<\U0001f4bb>', result)
@@ -294,7 +294,7 @@ def test_evalfile_surrogates_in_result(self):
             """)
         tcl.evalfile(filename)
         result = tcl.eval('set b')
-        if sys.platform == 'win32':
+        if sys.platform == 'win32' and tcl_version >= (9, 0):
             self.assertEqual('<\ud83d\udcbb>', result)
         else:
             self.assertEqual('<\U0001f4bb>', result)