Fixed version format of built packages

[harishsk]

Since we are no longer using the pre-release tag, our package versions at the daily build have had an improper version string with two hyphens in a row. This PR fixes that issue.
Our version format is not SemVer 2.0.0 compatible because according SemVer v2, the build metadata has to be separated by +. However this causes build warnings and attempting to fix the warnings causes the msbuild Pack task to not include build number in the package name.
That issue has to be resolved separately.

[codecov]

Codecov Report

Merging #5197 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5197      +/-   ##
==========================================
- Coverage   73.32%   73.31%   -0.01%     
==========================================
  Files        1007     1007              
  Lines      188386   187969     -417     
  Branches    20286    20241      -45     
==========================================
- Hits       138126   137809     -317     
+ Misses      44736    44634     -102     
- Partials     5524     5526       +2     

Flag	Coverage Δ
#Debug	73.31% <ø> (-0.01%)	⬇️
#production	69.06% <ø> (+0.05%)	⬆️
#test	87.44% <ø> (-0.11%)	⬇️

Impacted Files	Coverage Δ
...rosoft.ML.Data/DataView/BatchDataViewMapperBase.cs	68.67% <0.00%> (-0.84%)	⬇️
...rosoft.ML.Data/DataView/RowToRowMapperTransform.cs	90.65% <0.00%> (-0.82%)	⬇️
...rosoft.ML.Data/Transforms/PerGroupTransformBase.cs	76.33% <0.00%> (-0.46%)	⬇️
...Microsoft.ML.Transforms/OptionalColumnTransform.cs	77.68% <0.00%> (-0.46%)	⬇️
...rc/Microsoft.ML.Data/Scorers/RowToRowScorerBase.cs	85.95% <0.00%> (-0.36%)	⬇️
src/Microsoft.ML.Data/Transforms/NAFilter.cs	85.77% <0.00%> (-0.31%)	⬇️
src/Microsoft.ML.Data/DataView/Transposer.cs	83.92% <0.00%> (-0.27%)	⬇️
...Microsoft.ML.Data/DataView/ArrayDataViewBuilder.cs	83.90% <0.00%> (-0.27%)	⬇️
...osoft.ML.Transforms/Text/TokenizingByCharacters.cs	86.34% <0.00%> (-0.25%)	⬇️
...Microsoft.ML.Transforms/SvmLight/SvmLightLoader.cs	95.45% <0.00%> (-0.25%)	⬇️
... and 28 more