Fix the issue of password expiry event trigger of PasswordGrantHandler

[sandushi]

Purpose

$subject

Changes from this PR

• When the password is expired for the user, the password grant handler should return below.

{
  "error_description": "Authentication Failed! Password has expired",
  "error": "invalid_grant"
}

• But before trigger the triggerPasswordExpiryValidationEvent , the authentictaed user is return in the current implementation. Due to this even though the password is expired, the token is issued for the user.
• To fix this issue, the triggerPasswordExpiryValidationEvent should be triggered before return the authenticated user.

Related issue

This issue is identified and fixed with wso2/product-is#21890 effort.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.43%. Comparing base (9095d8d) to head (a8e87fe).
Report is 39 commits behind head on master.

Files with missing lines	Patch %	Lines
...th2/token/handlers/grant/PasswordGrantHandler.java	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2659      +/-   ##
============================================
+ Coverage     56.40%   56.43%   +0.02%     
+ Complexity     8269     8259      -10     
============================================
  Files           632      632              
  Lines         46680    46680              
  Branches       8508     8508              
============================================
+ Hits          26332    26345      +13     
+ Misses        16585    16573      -12     
+ Partials       3763     3762       -1     

Flag	Coverage Δ
unit	38.75% <60.00%> (-0.03%)	⬇️

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