[Spring Cleanup] Refactor oauth2 webapp to remove Spring Framework Dependency

[lashinijay]

Proposed changes in this pull request

• $subject

Related Issue(s)

• Remove Spring dependencies from Identity Server applications wso2/product-is#21159

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Codecov Report

Attention: Patch coverage is 48.57143% with 18 lines in your changes missing coverage. Please review.

Project coverage is 56.17%. Comparing base (32cb723) to head (15433b9).

Files with missing lines	Patch %	Lines
...bon/identity/oauth/endpoint/util/EndpointUtil.java	37.50%	9 Missing and 1 partial ⚠️
...tity/oauth/endpoint/authz/OAuth2AuthzEndpoint.java	20.00%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2675      +/-   ##
============================================
+ Coverage     55.66%   56.17%   +0.50%     
+ Complexity     8435     8189     -246     
============================================
  Files           632      631       -1     
  Lines         48587    46711    -1876     
  Branches       9300     8851     -449     
============================================
- Hits          27048    26240     -808     
+ Misses        17670    16710     -960     
+ Partials       3869     3761     -108     

Flag	Coverage Δ
unit	38.84% <48.57%> (-0.14%)	⬇️

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