Delete attribute to try fixing ops RuntimeError

Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/./src/machine_charm.py", line 59, in <module>
    ops.main.main(MachineSubordinateRouterCharm)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/venv/ops/main.py", line 429, in main
    charm = charm_class(framework)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/./src/machine_charm.py", line 28, in __init__
    self._database_provides = relations.database_providers_wrapper.RelationEndpoint(self)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/src/relations/database_providers_wrapper.py", line 32, in __init__
    self._database_provides = relations.database_provides.RelationEndpoint(charm_)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/src/relations/database_provides.py", line 149, in __init__
    self._interface = data_interfaces.DatabaseProvides(charm_, relation_name=self._NAME)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 756, in __init__
    super().__init__(charm, relation_name)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 373, in __init__
    super().__init__(charm, relation_name)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/venv/ops/framework.py", line 412, in __init__
    self.framework._track(self)
  File "/var/lib/juju/agents/unit-mysqlrouter-0/charm/venv/ops/framework.py", line 661, in _track
    raise RuntimeError(
RuntimeError: two objects claiming to be MachineSubordinateRouterCharm/DatabaseProvides[database] have been created

from https://github.com/canonical/mysql-router-operator/actions/runs/5404925316/jobs/9819825535

src/machine_charm.py

@@ -25,6 +25,7 @@ class MachineSubordinateRouterCharm(abstract_charm.MySQLRouterCharm):
     def __init__(self, *args) -> None:
         super().__init__(*args)
         # DEPRECATED shared-db: Enable legacy "mysql-shared" interface
+        del self._database_provides
         self._database_provides = relations.database_providers_wrapper.RelationEndpoint(self)
 
         self._authenticated_workload_type = socket_workload.AuthenticatedSocketWorkload