Remove ParallelizeDecorator introduced in #746

[shack05]

Fixes #2442
Removes ParallelizeDecorator feature introduced in #746

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Performance improvement
• Refactoring (so no functional change)
• Other (docs, build config, etc)

Checklist:

• I've added tests for my code. (most of the time mandatory)
• I have added an entry to the changelog. (mandatory)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[shack05]

I noticed the test XUnit2TestGeneratorProvider_WithFeatureWithMatchingTag_ShouldAddNonParallelizableCollectionAttribute I introduced in my previous PR should be failing.

This assertion should fail because I changed the argument of the XUnit collection attribute from NonParallelizable to SpecFlowNonParallelizableFeatures.

Changing lines 424-426 to the following will fix it:

attributes.Should().ContainSingle(a => a.Name == XUnitCollectionAttribute);
var collectionAttribute = attributes.Single(a => a.Name == XUnitCollectionAttribute);
collectionAttribute.Arguments.Should().HaveCount(1);
collectionAttribute.Arguments[0].Value.Should().BeEquivalentTo(new CodePrimitiveExpression("SpecFlowNonParallelizableFeatures"));

Do you want me to include that change in this PR?

[epresi]

Thanks for the PR @shack05!
I would merge this one, so please fix the test in a new PR.

[SabotageAndi]

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