Refactor send_decom_image_email workflow

[jcornall]

Description:

Refactoring of the send_decom_image_email workflow in line with wider StackStorm workflow refactoring.

The find_servers_with_image and list_to_regex_pattern functions have been moved from the workflow to a dedicated module within the /apis/openstack_query_api directory called server_queries. Unit tests have been updated.

Note: this PR is dependent on changes to user_queries made in #404.

Special Notes:

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Submitter:

Have you (where applicable):

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

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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

❌ Patch coverage is 93.93939% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.92%. Comparing base (35418aa) to head (37de106).
⚠️ Report is 5 commits behind head on refactor_email_workflows.

Files with missing lines	Patch %	Lines
lib/workflows/send_decom_image_email.py	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           refactor_email_workflows     #405      +/-   ##
============================================================
- Coverage                    100.00%   99.92%   -0.08%     
============================================================
  Files                           107      108       +1     
  Lines                          2609     2607       -2     
  Branches                        320      319       -1     
============================================================
- Hits                           2609     2605       -4     
- Misses                            0        1       +1     
- Partials                          0        1       +1     

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