[Backport 2.x] Remove failed login attempt for saml authenticator

[opensearch-trigger-bot]

Backport 39adb47 from #4762.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.45%. Comparing base (777fb59) to head (508fa1a).
Report is 1 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...zon/dlic/auth/http/saml/HTTPSamlAuthenticator.java	0.00%	1 Missing ⚠️
.../org/opensearch/security/auth/BackendRegistry.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #4770      +/-   ##
==========================================
+ Coverage   65.44%   65.45%   +0.01%     
==========================================
  Files         319      319              
  Lines       22250    22251       +1     
  Branches     3591     3592       +1     
==========================================
+ Hits        14561    14564       +3     
+ Misses       5888     5885       -3     
- Partials     1801     1802       +1     

Files with missing lines	Coverage Δ
...zon/dlic/auth/http/saml/HTTPSamlAuthenticator.java	67.51% <0.00%> (ø)
.../org/opensearch/security/auth/BackendRegistry.java	60.81% <50.00%> (-0.20%)	⬇️

... and 5 files with indirect coverage changes