Fix NPE in Organization Audience Shared Role Deletion

[HasiniSama]

Purpose

Fixes: wso2/product-is#22394

An NPE gets thrown when deleting Organization audience shared roles from an application. This is reproduced when switching the role audience to Application audience.

The NPE is thrown here, as the userRealm is null because the tenant flow hasn't started in the thread.

Approach

Started tenant flow before calling the roleManagementService.getAssociatedApplicationByRoleId() method.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 48.72%. Comparing base (b1959c9) to head (c16f172).
Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
...gement/handler/listener/SharedRoleMgtListener.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #432      +/-   ##
============================================
- Coverage     48.77%   48.72%   -0.06%     
+ Complexity     1280     1258      -22     
============================================
  Files           143      144       +1     
  Lines          8024     7986      -38     
  Branches        979      990      +11     
============================================
- Hits           3914     3891      -23     
+ Misses         3785     3770      -15     
  Partials        325      325              

Flag	Coverage Δ
unit	37.26% <0.00%> (-0.45%)	⬇️

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[HasiniSama]

This is tested for the following flows

• Switching the role audience to Application audience from Organization audience. (application update post-listener)
• Delete a shared application with roles set to the Organization audience. (application deletion post-listener)
• Unshare an application with roles set to the Organization audience. (application deletion post-listener)

[HasiniSama]

However, the IDE shows the code coverage as 100% for lines added: