Mark oauth2 extension as stable (#40193)

oauth2 extension is widely used and has been stable for some time.

Risk Level: Low
Testing: n/a
Docs Changes: n/a
Release Notes: Yes
Platform Specific Features: n/a

---------

Signed-off-by: Yan Avlasov <[email protected]>

Author: yanavlasov

changelogs/current.yaml

@@ -101,6 +101,9 @@ minor_behavior_changes:
   change: |
     Now the ``METADATA`` and ``CEL`` substitution formatters could access or log the metadata of
     virtual host in case the route is not matched but the virtual host is found.
+- area: oauth2
+  change: |
+    Extension status changed from ``alpha`` to ``stable``.
 
 bug_fixes:
 # *Changes expected to improve the state of the world and are unlikely to have negative effects*

source/extensions/extensions_metadata.yaml

@@ -512,7 +512,7 @@ envoy.filters.http.oauth2:
   categories:
   - envoy.filters.http
   security_posture: robust_to_untrusted_downstream
-  status: alpha
+  status: stable
   type_urls:
   - envoy.extensions.filters.http.oauth2.v3.OAuth2
 envoy.filters.http.on_demand: