Fixed no-namespace bug in Alert model

[abyrne55]

There's a bug in the database event hook Alert._set_firing_details() that causes Alert database record creation to fail if a PagerDuty alert's firing_details field does not contain namespace info. The specific error is as follows:

ERROR:__main__:Failed to process alert Q0XYZTXYZIA6P
Traceback (most recent call last):
  File "/opt/app-root/src/updater.py", line 128, in update_alerts
    alert = Alert.from_pd_api_response(
  File "/opt/app-root/src/models.py", line 396, in from_pd_api_response
    alert.firing_details = res_dict["body"]["details"]["firing"]
  File "/opt/app-root/lib64/python3.9/site-packages/sqlalchemy/orm/attributes.py", line 459, in __set__
    self.impl.set(
  File "/opt/app-root/lib64/python3.9/site-packages/sqlalchemy/orm/attributes.py", line 1097, in set
    value = self.fire_replace_event(
  File "/opt/app-root/lib64/python3.9/site-packages/sqlalchemy/orm/attributes.py", line 1105, in fire_replace_event
    value = fn(
  File "/opt/app-root/lib64/python3.9/site-packages/sqlalchemy/orm/events.py", line 2266, in wrap
    fn(target, *arg)
  File "/opt/app-root/src/models.py", line 419, in _set_firing_details
    target.namespace = namespace_re.group(1)
AttributeError: 'NoneType' object has no attribute 'group'

This is due to an AttributeError raised when the code tries to fetch a non-existent regex result. With this PR, that exception will now be caught and logged as a warning. This PR also adds a sample alert that triggers this error to sample_incident_alerts.json and updates the unit tests for the Alert model such that they can now handle these multi-alert sample files.

This PR addresses bug OSD-10952.

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This pull-request has been approved by: abyrne55, fahlmant

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