Fix ADD operation replacing permissions of the role

[ThaminduR]

Problem

When performing an ADD operation on a role's permissions via the SCIM2 API, the existing permissions are incorrectly replaced instead of appending the new permissions.

Root Cause

The issue was caused by the prepareReplacedPermissionLists method being executed for every patch operation. This method clears the existing permissions, which is appropriate for the REPLACE operation but not for ADD or REMOVE.

Solution

• The fix ensures that prepareReplacedPermissionLists is only executed for the REPLACE operation, preventing unintended clearing of permissions during ADD or REMOVE operations.

• Added unit tests scenarios to cover the permission update operations

Issue

wso2/product-is#21628

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.66%. Comparing base (c457f30) to head (0a694ab).
Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #588      +/-   ##
============================================
+ Coverage     44.45%   44.66%   +0.20%     
+ Complexity     1035      965      -70     
============================================
  Files            41       41              
  Lines          8943     9008      +65     
  Branches       1925     1929       +4     
============================================
+ Hits           3976     4023      +47     
- Misses         4092     4100       +8     
- Partials        875      885      +10     

Flag	Coverage Δ
unit	29.29% <100.00%> (+0.69%)	⬆️

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