Adding logic to handle gzip'd botocore ec2 service-2.json

[jake-skipper]

Summary

Newer versions of botocore are now shipping with some files gzipped to save on storage space. Runway's K8s module depended on one of these files to determine available EC2 instance types, and could not read it as the path had changed (service-2.json vs service-2.json.gz).

Why This Is Needed

Because of this upstream change, users who install a newer botocore version are unable to execute runway without an error.

What Changed

Because we can't tell which version of botocore a user may have in their environment, logic has been added to check for which is available. In local testing this seems to work well. We were able to do a fresh runway install and confirm functionality with the gzipped file, then performed a gunzip on it and runway still operated fine with the uncompressed file.

Checklist

• Have you followed the guidelines in our Contribution Requirements?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission pass tests?
• Have you linted your code locally prior to submission?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?
• Have you updated documentation, as applicable?

[jake-skipper]

This PR is in regards to #2060

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c9f08e6) 90.18% compared to head (c66016d) 90.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2073      +/-   ##
==========================================
- Coverage   90.18%   90.17%   -0.02%     
==========================================
  Files         247      247              
  Lines       15682    15691       +9     
==========================================
+ Hits        14143    14149       +6     
- Misses       1539     1542       +3     

Files	Coverage Δ
runway/blueprints/k8s/k8s_workers.py	92.68% <75.00%> (-7.32%)	⬇️

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