Move control over min. req'd confirmations to the managed code

[AArnott]

No description provided.

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (20fe2d4) 76.13% compared to head (7d197ad) 76.08%.

Files	Patch %	Lines
src/Nerdbank.Zcash/RustBindings/LightWallet.cs	0.00%	22 Missing ⚠️
src/Nerdbank.Zcash/LightWalletClient.cs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   76.13%   76.08%   -0.06%     
==========================================
  Files         150      150              
  Lines        8860     8866       +6     
  Branches      810      810              
==========================================
  Hits         6746     6746              
- Misses       1915     1921       +6     
  Partials      199      199              

Flag	Coverage Δ
LinuxHost	76.08% <0.00%> (-0.06%)	⬇️
Release	76.08% <0.00%> (-0.06%)	⬇️
WindowsHost	76.08% <0.00%> (-0.06%)	⬇️
macOSHost	76.08% <0.00%> (-0.06%)	⬇️

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