added test cases for asset bed

[DraKen0009]

Proposed Changes

• Added test cases for asset bed module
• Adding more test for bed create module
• Updated PermissionError with PermissionDenied for better handling of permission errors

Associated Issue

• Fixes Adds test for various endpoints in the assetbed module #1386
• Part of Updating Tests in the Care Project #1372

Merge Checklist

• Tests added/fixed
• Linting Complete

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@ohcnetwork/care-backend-maintainers @ohcnetwork/care-backend-admins

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.76%. Comparing base (08f0c72) to head (4ae4ef5).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
care/facility/api/serializers/asset.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2532      +/-   ##
===========================================
+ Coverage    65.59%   65.76%   +0.16%     
===========================================
  Files          223      223              
  Lines        13383    13386       +3     
  Branches      1855     1855              
===========================================
+ Hits          8779     8803      +24     
+ Misses        4218     4194      -24     
- Partials       386      389       +3     

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