fix: spring security http headers configuration

[RadovanTomik]

Negotiator pull request:

Description:

Adds default configurations for csfr and cors headers.

Checklist:

Make sure you tick all the boxes bellow if they are true or do not apply:

• I have performed a self review of my code
• My code follows Google Java Code style
• I have made my code as simple as possible
• I have added unit tests and the code coverage has not decreased
• I have updated the documentation in all relevant places

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 78.50%. Comparing base (e5e25f8) to head (ea0770a).

Files	Patch %	Lines
...or/configuration/security/OAuthSecurityConfig.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #255      +/-   ##
============================================
- Coverage     78.54%   78.50%   -0.04%     
+ Complexity      895      894       -1     
============================================
  Files           122      122              
  Lines          2740     2740              
  Branches        154      155       +1     
============================================
- Hits           2152     2151       -1     
  Misses          490      490              
- Partials         98       99       +1     

Flag	Coverage Δ
unit	78.50% <66.66%> (-0.04%)	⬇️

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