fix(migration): Do not emit log output for checker_id normalisation

In case a new product is added to an empty sever, what happens in the
background is a full "migration" from the "empty" state to the newest
schema, which results in the log output that is removed by this patch on
the standard output of the server.

These lines are not directly needed, but there is no good reason to hide
them behind an `if len(...):` check either. In case actual rows are
migrated (which never happens when a new product is added to the
server), the appropriate output showing the row count of the `UPDATE`
statement will be printed to the output normally.

web/server/codechecker_server/migrations/report/versions/c3dad71f8e6b_store_information_about_enabled_and_disabled_checkers_for_a_run.py

@@ -47,9 +47,6 @@ def normalise_report_analyzer_and_checker_names():
         # These values are normalised such that in the following, when the
         # foreign key-based look-up is added to the schema, their new
         # 'checker_id' will all point to the single "UNKNOWN/NOT FOUND" case.
-        LOG.info("Normalising unknowns in 'reports'.'analyzer_name' and "
-                 "'reports'.'checker_id'...")
-
         analyzer_name_affected = conn.execute(f"""
             UPDATE reports
             SET analyzer_name = '{UnknownChecker[0]}'