Add config for usernames recovery when claims are not unique

[KD23243]

Proposed changes in this pull request

Ability to set the behavior of username recovery when claims are not unique.

Related Git Issue

• Support usernames recovery when email address is not unique product-is#21073

Related PRs

• Support usernames recovery when claims are not unique wso2-extensions/identity-governance#859

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.40%. Comparing base (9edd086) to head (57f8b14).
Report is 68 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5946      +/-   ##
============================================
+ Coverage     22.74%   23.40%   +0.66%     
- Complexity     6096     6272     +176     
============================================
  Files          1561     1561              
  Lines         99248    99253       +5     
  Branches      15187    15192       +5     
============================================
+ Hits          22574    23232     +658     
+ Misses        73417    72751     -666     
- Partials       3257     3270      +13     

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