[2.0.0-prepare][Improvement#6655] [UI] remove registry monitor (#6789)

[CalvinKirs]

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This pull request is code cleanup without any test coverage.

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@@                   Coverage Diff                    @@
##             2.0.0-release-prepare    #6824   +/-   ##
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  Coverage                         ?   37.64%           
  Complexity                       ?     3210           
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  Files                            ?      648           
  Lines                            ?    26383           
  Branches                         ?     2849           
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  Hits                             ?     9932           
  Misses                           ?    15535           
  Partials                         ?      916           

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