Standardize response output

[pem70]

What It Does
Simplify request handler to return response content directly (#266)

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

Attention: Patch coverage is 77.41935% with 7 lines in your changes missing coverage. Please review.

Project coverage is 89.28%. Comparing base (cdf6265) to head (d8bd067).

❗ Current head d8bd067 differs from pull request most recent head af80a88

Please upload reports for the commit af80a88 to get more accurate results.

Files	Patch %	Lines
src/core/zowe/core_for_zowe_sdk/request_handler.py	33.33%	2 Missing ⚠️
src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py	0.00%	2 Missing ⚠️
src/core/zowe/core_for_zowe_sdk/profile_manager.py	50.00%	1 Missing ⚠️
src/zos_files/zowe/zos_files_for_zowe_sdk/files.py	0.00%	1 Missing ⚠️
src/zos_files/zowe/zos_files_for_zowe_sdk/uss.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #284   +/-   ##
=======================================
  Coverage   89.28%   89.28%           
=======================================
  Files          53       53           
  Lines        2519     2530   +11     
=======================================
+ Hits         2249     2259   +10     
- Misses        270      271    +1     

Flag	Coverage Δ
unittests	89.28% <77.41%> (+<0.01%)	⬆️

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