Update imports and test exclusions for Shiny evaluation

Changed import of ShinyTestGenerator to use a relative path in create_test_metadata.py. Updated test_shiny_import.py to exclude '/testing/evaluation/apps/' from the tested paths.

Author: karangattu

shiny/testing/evaluation/scripts/create_test_metadata.py

@@ -2,7 +2,7 @@
 from itertools import islice
 from pathlib import Path
 
-from shiny.testing import ShinyTestGenerator
+from ...generator import ShinyTestGenerator
 
 
 def generate_shiny_test_metadata(

tests/pytest/test_shiny_import.py

@@ -33,6 +33,7 @@ def test_shiny_import_itself():
         for path in shiny_files
         if "/api-examples/" not in path
         and "/templates/" not in path
+        and "/testing/evaluation/apps/" not in path
         and Path(path).is_file()
     ]