Fix erroneous use of TaskContinuationOptions in ThreadUtils.cs

[stephentoub]

This was supposed to be TaskCreationOptions. TaskContinuationOptions here will end up binding to the wrong ctor, and won't actually have the desired effect, which is to avoid blocking the thread completing this TCS.

Thanks @sharwell for flagging it with CA2247.

[codecov]

Codecov Report

Merging #5753 (2c5f888) into main (ebc431f) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5753      +/-   ##
==========================================
+ Coverage   68.38%   68.41%   +0.03%     
==========================================
  Files        1131     1131              
  Lines      241019   241217     +198     
  Branches    25024    25071      +47     
==========================================
+ Hits       164822   165032     +210     
+ Misses      69714    69702      -12     
  Partials     6483     6483              

Flag	Coverage Δ
Debug	68.41% <100.00%> (+0.03%)	⬆️
production	63.04% <100.00%> (+0.01%)	⬆️
test	89.24% <ø> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Microsoft.ML.Core/Utilities/ThreadUtils.cs	83.67% <100.00%> (ø)
....ML.AutoML/PipelineSuggesters/PipelineSuggester.cs	81.88% <0.00%> (-3.15%)	⬇️
...rosoft.ML.AutoML/ColumnInference/TextFileSample.cs	59.60% <0.00%> (-2.65%)	⬇️
src/Microsoft.ML.AutoML/Sweepers/Parameters.cs	84.74% <0.00%> (-0.85%)	⬇️
...ML.Transforms/Text/StopWordsRemovingTransformer.cs	86.53% <0.00%> (-0.15%)	⬇️
...st/Microsoft.Data.Analysis.Tests/DataFrameTests.cs	100.00% <0.00%> (+0.05%)	⬆️
src/Microsoft.Data.Analysis/DataFrame.Join.cs	99.31% <0.00%> (+1.40%)	⬆️
src/Microsoft.ML.Maml/MAML.cs	26.21% <0.00%> (+2.42%)	⬆️
...c/Microsoft.ML.Data/Prediction/PredictionEngine.cs	87.17% <0.00%> (+10.70%)	⬆️
...c/Microsoft.ML.FastTree/Utils/ThreadTaskManager.cs	100.00% <0.00%> (+20.51%)	⬆️

[michaelgsharp]

/azp run

[azure-pipelines]

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