fix job-output path handling

[ATorrise]

What It Does

• Fixes get_job_output_as_files which was writing to a folder it never created and crashing with FNF
• Builds the output paths so they match the folders the method actually makes
• Checks job values from the response before using them as folder names
• Rejects any name with .. in it (team discussion request)
• Rejects any name that is an absolute path (team discussion request)
• Makes sure the final file path stays inside the output folder

How to Test

Review Checklist
I certify that I have:

• updated the changelog
• manually tested my changes
• added/updated automated unit/integration tests
• created/ran system tests (provide build number if applicable)
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.89%. Comparing base (096a095) to head (351ba77).

Files with missing lines	Patch %	Lines
src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py	88.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
+ Coverage   82.11%   82.89%   +0.78%     
==========================================
  Files          49       49              
  Lines        2919     2947      +28     
==========================================
+ Hits         2397     2443      +46     
+ Misses        522      504      -18     

Flag	Coverage Δ
unittests	82.89% <88.23%> (+0.78%)	⬆️

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