updating customizations/utility

[varungovinda]

Issue #, if available:

Description of changes: This PR updates the get_policy_arn_suffix function to dynamically load AWS partition information using botocore's RuleSetStandardLibary and partitions.json instead of hardcoded region mappings.

Affected commands:

• aws dlm create-default-role
• aws emr create-default-roles
• aws emr-containers update-role-trust-policy

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.33%. Comparing base (68039fa) to head (4efb848). :warning: Report is 368 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9816      +/-   ##
===========================================
- Coverage    93.40%   93.33%   -0.07%     
===========================================
  Files          211      209       -2     
  Lines        17012    16808     -204     
===========================================
- Hits         15890    15688     -202     
+ Misses        1122     1120       -2     

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