fix(User Management): re-gen service and update tests after API changes

[padamstx]

PR summary

This PR contains a re-gen of the User Management service plus updates to the integration tests after recent API changes.

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Merging #62 (ecffddb) into master (26a9e5f) will decrease coverage by 0.02%.
The diff coverage is 92.52%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   93.65%   93.63%   -0.03%     
==========================================
  Files          19       19              
  Lines       18924    18989      +65     
==========================================
+ Hits        17724    17781      +57     
- Misses       1200     1208       +8     

Impacted Files	Coverage Δ
ibm_platform_services/user_management_v1.py	93.24% <92.52%> (-0.75%)	⬇️

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[ibm-devx-automation]

🎉 This PR is included in version 0.15.5 🎉

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