Deprecate some args

[ldgauthier]

Deprecate an untested VariantRecalibrator arg
Deprecate an old reblocking arg that produced invalid GVCFs
Rip out old GnarlyGenotyper code with diploid assumption
Will enable #7750

[codecov]

Codecov Report

Merging #8140 (a102c2d) into master (0261d43) will decrease coverage by 0.006%.
The diff coverage is 100.000%.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #8140       +/-   ##
===============================================
- Coverage     86.648%   86.642%   -0.006%     
+ Complexity     38974     38957       -17     
===============================================
  Files           2337      2337               
  Lines         182791    182698       -93     
  Branches       20067     20045       -22     
===============================================
- Hits          158385    158294       -91     
- Misses         17364     17370        +6     
+ Partials        7042      7034        -8     

Impacted Files	Coverage Δ
...bender/tools/walkers/variantutils/ReblockGVCF.java	80.244% <ø> (ø)
...ute/hellbender/utils/variant/GATKVCFConstants.java	80.000% <ø> (ø)
...e/hellbender/utils/variant/GATKVCFHeaderLines.java	95.337% <ø> (-0.048%)	⬇️
...tools/walkers/gnarlyGenotyper/GnarlyGenotyper.java	83.168% <100.000%> (ø)
...walkers/gnarlyGenotyper/GnarlyGenotyperEngine.java	77.647% <100.000%> (-3.906%)	⬇️
...bender/tools/walkers/vqsr/VariantRecalibrator.java	86.168% <100.000%> (ø)
...gnarlyGenotyper/GnarlyGenotyperEngineUnitTest.java	88.889% <100.000%> (-5.632%)	⬇️
...itute/hellbender/tools/LocalAssemblerUnitTest.java	92.448% <0.000%> (ø)
... and 1 more

[lbergelson]

@ldgauthier One comment which you are welcome to ignore