BUG: Skip any migration or snapshot steps if we're in an invalid state

[DavidFair]

Description:

Skips any migration steps, as we would previously take a snapshot - force the user to wait for multiple hours then fail when we knew up-front it wouldn't work.

Instead provide rapid feedback that we can't do an error state or we can't migrate before doing any work

TODO: test this works on dev once #459 is merged

Special Notes:

---

Submitter:

Have you (where applicable):

• Added unit tests?
• Checked the latest commit runs on Dev?
• Updated the example config file(s) and README?

---

Reviewer

Does this PR:

• Place non-StackStorm code into the lib directory?
• Have unit tests for the action/sensor and lib layers?
• Have clear and obvious action parameter names and descriptions?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.19%. Comparing base (5e00a96) to head (eeaf104).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           add_flag_live_migration     #461   +/-   ##
========================================================
  Coverage                    99.19%   99.19%           
========================================================
  Files                          112      112           
  Lines                         2737     2739    +2     
  Branches                       339      340    +1     
========================================================
+ Hits                          2715     2717    +2     
  Misses                          19       19           
  Partials                         3        3           

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[DavidFair]

Now correctly skips all steps if we attempt to do it with an error:

st2.actions.python.OpenstackActions: DEBUG    with Parameters: server_id: 4dbe774a-b036-4b1c-8323-ad167df31cbe
live_migration: False
cloud_account: dev
dest_host: None
snapshot: True
Traceback (most recent call last):
  File "/opt/stackstorm/st2/lib/python3.10/site-packages/python_runner/python_action_wrapper.py", line 397, in <module>
    obj.run()
  File "/opt/stackstorm/st2/lib/python3.10/site-packages/python_runner/python_action_wrapper.py", line 216, in run
    output = action.run(**self._parameters)
  File "/opt/stackstorm/packs/stackstorm_openstack/actions/src/openstack_actions.py", line 34, in run
    return action_func(**kwargs)
  File "/opt/stackstorm/packs/stackstorm_openstack/lib/apis/openstack_api/openstack_server.py", line 88, in snapshot_and_migrate_server
    raise ValueError(
ValueError: Server status: ERROR. The server must be ACTIVE or SHUTOFF to be migrated
"
  stdout: ''