Leave idle state after endpoint becomes available again

[pnv1]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 47.24%. Comparing base (af6db56) to head (3f52adf).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...main/java/tech/ydb/core/impl/pool/GrpcChannel.java	66.66%	3 Missing ⚠️
...ava/tech/ydb/core/impl/SingleChannelTransport.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #307   +/-   ##
=========================================
  Coverage     47.23%   47.24%           
  Complexity     1703     1703           
=========================================
  Files           304      304           
  Lines         12225    12226    +1     
  Branches       1220     1220           
=========================================
+ Hits           5775     5776    +1     
  Misses         5997     5997           
  Partials        453      453           

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