[FIX] base: Update non-stored field error logging to include exc details

We have many issues with this log, except that with a `logger.error` we
do not have exception information (exc_info).

As mentionned in the documentation above, we cannot use `logger.exception`
in this case because we are not within an exception handler.
However, we can still retrieve the exception information using `sys`
module and the `exc_info()` method.

https://docs.python.org/3/library/logging.html#logging.Logger.exception
```
exception(msg, *args, **kwargs)
  ...
  This method should only be called from an exception handler.
```

https://docs.python.org/3/library/sys.html#sys.exc_info
```
sys.exc_info()
This function returns the old-style representation of the handled exception.
...
If no exception is being handled anywhere on the stack, this function
return a tuple containing three None values.
...
```

closes odoo/odoo#124208

X-original-commit: b0844d2f3c0c9655746b4c16c9b612bae9954618
Signed-off-by: Christophe Simonis (chs) <chs@odoo.com>

odoo/osv/expression.py

@@ -1105,7 +1105,7 @@ class expression(object):
                 # Non-stored field should provide an implementation of search.
                 if not field.search:
                     # field does not support search!
-                    _logger.error("Non-stored field %s cannot be searched.", field)
+                    _logger.error("Non-stored field %s cannot be searched.", field, exc_info=True)
                     if _logger.isEnabledFor(logging.DEBUG):
                         _logger.debug(''.join(traceback.format_stack()))
                     # Ignore it: generate a dummy leaf.