typing: suppress a bunch of potential import-error cases in extensions As flagged by pytype locally. Either the ImportError is locally handled, or the imported module was previously determined to be present by `hgave` (for the phabricator extension), or is handled by the `hgext.convert.subversion` module when imported (for the `hgext.convert.transport` module).

--- a/hgext/releasenotes.py	Thu Jan 05 00:09:48 2023 -0500
+++ b/hgext/releasenotes.py	Fri Jan 06 13:04:50 2023 -0500
@@ -50,7 +50,7 @@
             module="fuzzywuzzy.fuzz",
         )
 
-        import fuzzywuzzy.fuzz as fuzz
+        import fuzzywuzzy.fuzz as fuzz  # pytype: disable=import-error
 
         fuzz.token_set_ratio
 except ImportError: