Downgrade log message

Downgrade log message when an error occurs while iterating processes to
search for ansysedt sessions.  Rationale:

1. If any error occurs during the ansysedt session search process loop,
   the end result is that the process in question is not returned as a
   potential ansysedt session.  This is generally not harmful.
2. There is nothing the user could have done to make the error not
   occur: they have no control over the processes on the machine, the
   behavior of `psutil`, or the logic in this loop.
3. Downgrading to debug allows us to also log the full stack trace of
   the exception, allowing us to identify fixes to the logic for cases
   that fail in the future.

Author: isaacwaldron

src/ansys/aedt/core/generic/general_methods.py

@@ -754,9 +754,10 @@ def _current_username():
         except psutil.NoSuchProcess as e:  # pragma: no cover
             pyaedt_logger.debug(f"The process exited and cannot be an active session: {e}")
         except Exception as e:  # pragma: no cover
-            pyaedt_logger.error(
+            pyaedt_logger.debug(
                 f"A(n) {type(e)} error occurred while retrieving information for the active AEDT sessions: {e}"
             )
+            pyaedt_logger.debug(traceback.format_exc())
     return return_dict