Regression alpha algorithm updates

[StefanoRaggi]

Description

• The expected statistics for the ForexCalendarAlpha and RebalancingLeveragedETFAlpha algorithms were out of date and have been updated to the current master branch
• The actual statistics for RebalancingLeveragedETFAlpha were different between C# and Python version due to the Decimal changes introduced in C# decimal to Python conversion #2829, the algorithm has been updated to round return values before comparisons.

Related Issue

#2829

Motivation and Context

1. Regression incorrect expected statistics
2. Difference between C# and Python versions of the same algorithm

Requires Documentation Change

No.

How Has This Been Tested?

Alpha regression tests in the cloud.

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 change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description or feature-<issue#>-<description>

[jaredbroad]

Merge pending understanding why the DFX algorithm changed: Algorithm.CSharp/Alphas/ForexCalendarAlpha.cs