refactor(settings): rename get_settings to get_global_settings

[glevco]

Motivation

Rename the get_settings() function to get_global_settings() as requested in this comment: #768 (comment)

Acceptance Criteria

• Rename the get_settings() function to get_global_settings().
• No behavior should be changed.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f5ef856) 85.23% compared to head (273d228) 85.29%.

Files	Patch %	Lines
...on/storage/migrations/remove_first_nop_features.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #919      +/-   ##
==========================================
+ Coverage   85.23%   85.29%   +0.06%     
==========================================
  Files         285      285              
  Lines       22370    22370              
  Branches     3371     3371              
==========================================
+ Hits        19066    19080      +14     
+ Misses       2633     2618      -15     
- Partials      671      672       +1     

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