Code cleanup and remove APIs to create polices (accept/reject all)

[jonesbusy]

Description

Code cleanup and remove APIs to create polices (accept/reject all)

Testing done

CI

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.28%. Comparing base (7a6843a) to head (8d60fa7).

Files with missing lines	Patch %	Lines
...c/main/java/land/oras/policy/ContainersPolicy.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #788      +/-   ##
============================================
+ Coverage     86.88%   87.28%   +0.39%     
+ Complexity     1239     1238       -1     
============================================
  Files            50       50              
  Lines          4004     3996       -8     
  Branches        543      543              
============================================
+ Hits           3479     3488       +9     
+ Misses          311      294      -17     
  Partials        214      214              

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