[FIX] core: avoid 'Registry' object has no attribute '_m2m' error

This is because the `env.registry` may not be the latest registry in the
Registries pool, which happens when new modules are installed by a request and
fail. In the `setup_model` the `_m2m` is set to the old registry, but models
will try to read the `_m2m` from the latest registry and raise 'Registry' object
has no attribute '_m2m' error

This commit fix the issue by resetting the env when necessary

closes odoo/odoo#146544

X-original-commit: a433f3175a5105d9028dd9937d5461ae2d5d11fe
Signed-off-by: Raphael Collet <rco@odoo.com>

odoo/service/model.py

@@ -138,6 +138,7 @@ def retrying(func, env):
                 if env.cr._closed:
                     raise
                 env.cr.rollback()
+                env.reset()
                 env.registry.reset_changes()
                 if request:
                     request.session = request._get_session_and_dbname()[0]
@@ -163,6 +164,7 @@ def retrying(func, env):
             raise RuntimeError("unreachable")
 
     except Exception:
+        env.reset()
         env.registry.reset_changes()
         raise