remove_dnsha does not use `name` parameter

[Samuel Allan]

The remove_dnsha method takes a `name` parameter, but does not use it. Instead, it uses `self.service_name`, which is not always defined. This was discovered by a crash in kubeapi-load-balancer charm:

```
2023-09-27 07:44:58 ERROR unit.kubeapi-load-balancer/0.juju-log server.go:325 'HAServiceRequires' object has no attribute 'service_name'
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-kubeapi-load-balancer-0/charm/venv/charms/reconciler.py", line 34, in reconcile
    result = self.reconcile_function(event)
  File "/var/lib/juju/agents/unit-kubeapi-load-balancer-0/charm/./src/charm.py", line 333, in _reconcile
    self._configure_hacluster()
  File "/var/lib/juju/agents/unit-kubeapi-load-balancer-0/charm/./src/charm.py", line 115, in _configure_hacluster
    self.hacluster.update_dns()
  File "/var/lib/juju/agents/unit-kubeapi-load-balancer-0/charm/src/hacluster.py", line 136, in update_dns
    self.interface.remove_dnsha(self._unit_name, "public")
  File "/var/lib/juju/agents/unit-kubeapi-load-balancer-0/charm/venv/interface_hacluster/common.py", line 258, in remove_dnsha
    self.service_name.replace('-', '_'),
AttributeError: 'HAServiceRequires' object has no attribute 'service_name'
```

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-interface-hacluster/+/896620

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/charm-interface-hacluster/+/896620
Committed: https://opendev.org/openstack/charm-interface-hacluster/commit/d91e83a1fa59a13f4160febfe536c68dc762e436
Submitter: "Zuul (22348)"
Branch: master

commit d91e83a1fa59a13f4160febfe536c68dc762e436
Author: Samuel Walladge <email address hidden>
Date: Wed Sep 27 18:15:42 2023 +0930

    Use the passed arguments in remove_dnsha

    This appears to be a typo, where self.service_name and self.endpoint_type
    was used in the same way as seen in other methods,
    but self.service_name or self.endpoint_type is not defined in this class,
    or any subclasses of it.
    So we can use the passed name and endpoint_type arguments here.

    Closes-Bug: #2037515
    Change-Id: I12c561057372c11632b2d97fa1763fc92d89f479