[Edge] Edge2Edge.Websocket: migrate reference target & update JUnit tests

[PunugupatiSaikumar]

Summary

Follow-up to the Reference Target Plugin migration: migrates the Edge2Edge Websocket components that still used OpenemsComponent.updateReferenceFilter() for the Bridge reference.

• Edge2Edge.Websocket.Ess
• Edge2Edge.Websocket.GenericReadComponent
  Changes:
• Add @GenerateTargetsFromReferences("Bridge") and target filter (&(id=${config.bridge_id})(enabled=true)) on bindBridge
• Keep Bridge as DYNAMIC / GREEDY / OPTIONAL (unchanged)
• Remove ConfigurationAdmin (was only used for updateReferenceFilter)
• Remove obsolete Bridge_target() from both Configs

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3925      +/-   ##
=============================================
+ Coverage      55.71%   55.72%   +0.01%     
- Complexity     19114    19117       +3     
=============================================
  Files           3674     3674              
  Lines         172011   172009       -2     
  Branches       14175    14175              
=============================================
+ Hits           95824    95834      +10     
+ Misses         72395    72382      -13     
- Partials        3792     3793       +1     

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