Remove failed login attempt for saml authenticator

[derek-ho]

Description

Removes audit log entry of failed login for all SAML authentication since it will always re-request authentication

Issues Resolved

Fix: #4608
Is this a backport? If so, please add backport PR # and/or commits #, and remove backport-failed label from the original PR.
No
Do these changes introduce new permission(s) to be displayed in the static dropdown on the front-end? If so, please open a draft PR in the security dashboards plugin and link the draft PR here
No

Testing

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[cwperks]

@derek-ho Can you rebase with the latest from main?

[derek-ho]

@derek-ho Can you rebase with the latest from main?

Done

[codecov]

Codecov Report

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

Project coverage is 65.61%. Comparing base (3ad09c8) to head (49e0da4).
Report is 4 commits behind head on main.

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           @@
##             main    #4762   +/-   ##
=======================================
  Coverage   65.60%   65.61%           
=======================================
  Files         321      321           
  Lines       22539    22540    +1     
  Branches     3611     3612    +1     
=======================================
+ Hits        14787    14789    +2     
+ Misses       5939     5938    -1     
  Partials     1813     1813           

Files with missing lines	Coverage Δ
...zon/dlic/auth/http/saml/HTTPSamlAuthenticator.java	67.51% <0.00%> (ø)
.../org/opensearch/security/auth/BackendRegistry.java	62.38% <50.00%> (-0.20%)	⬇️

... and 2 files with indirect coverage changes