[Clean Up] Clean Webfinger Code

[Thumimku]

Proposed changes in this pull request

1. Log is a static final variable, so it should be "LOG" not "log".
2. Clean some unwanted lines.
3. Checking for debug enabled is redundent, but improve performance if the logging message contains computations. But if there is no computations, no concatinations then checking debug enabled affect the performance. Hence I selectively remove debug enabled checks if the message is simple.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/11776547371

[codecov]

Codecov Report

Attention: Patch coverage is 22.72727% with 17 lines in your changes missing coverage. Please review.

Project coverage is 54.48%. Comparing base (69881de) to head (9736322).
Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
.../identity/webfinger/DefaultWebFingerProcessor.java	20.00%	7 Missing and 1 partial ⚠️
.../webfinger/internal/WebFingerServiceComponent.java	0.00%	8 Missing ⚠️
...n/identity/webfinger/servlet/WebFingerServlet.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2624      +/-   ##
============================================
- Coverage     55.24%   54.48%   -0.76%     
- Complexity     8260     8336      +76     
============================================
  Files           632      632              
  Lines         47943    49518    +1575     
  Branches       7867     8256     +389     
============================================
+ Hits          26484    26979     +495     
- Misses        17630    18622     +992     
- Partials       3829     3917      +88     

Flag	Coverage Δ
unit	38.64% <22.72%> (-0.05%)	⬇️

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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/11776547371
Status: failure

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/11789838759

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/11789838759
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/11789838759