ensure prepare rename does not try to register with the client

[david-driscoll]

Fixes #409

[codecov]

Codecov Report

Merging #414 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #414      +/-   ##
==========================================
- Coverage   72.61%   72.57%   -0.04%     
==========================================
  Files         569      569              
  Lines       13780    13780              
  Branches     1292     1292              
==========================================
- Hits        10006    10001       -5     
- Misses       3774     3779       +5     

Impacted Files	Coverage Δ
src/Protocol/Document/IPrepareRenameHandler.cs	0.00% <ø> (ø)
src/JsonRpc/Server/Messages/ParseError.cs	0.00% <0.00%> (-100.00%)	⬇️
src/JsonRpc/InputHandler.cs	90.78% <0.00%> (-1.06%)	⬇️
src/Server/LanguageServerHelpers.cs	91.33% <0.00%> (+1.57%)	⬆️
test/TestingUtils/FactWithSkipOnAttribute.cs	100.00% <0.00%> (+21.42%)	⬆️

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