Drop deprecated code for 0.107.0

[roman-khimov]

Fixes #3454.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.12%. Comparing base (2b1b9a4) to head (3f1ccdd).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/core/state/native_state.go	60.00%	1 Missing and 1 partial ⚠️
pkg/rpcclient/waiter/waiter.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3690      +/-   ##
==========================================
+ Coverage   82.98%   83.12%   +0.13%     
==========================================
  Files         334      334              
  Lines       46603    46543      -60     
==========================================
+ Hits        38672    38687      +15     
+ Misses       6355     6283      -72     
+ Partials     1576     1573       -3     

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[AnnaShaleva]

LGTM.