[YUNIKORN-2896] [shim] Remove occupiedResource handling logic

[pbacsko]

What is this PR for?

Remove existing code related to occupiedResource.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2896

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.50%. Comparing base (753e4f8) to head (500dd49).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/cache/context.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #927      +/-   ##
==========================================
- Coverage   68.62%   68.50%   -0.13%     
==========================================
  Files          70       70              
  Lines        7675     7607      -68     
==========================================
- Hits         5267     5211      -56     
+ Misses       2202     2189      -13     
- Partials      206      207       +1     

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[craigcondit]

+1 LGTM.