Add Tests for MaximumDrawdownPercentPortfolio

[Marinovsky]

Description

Add unit tests for MaximumDrawdownPercentPortfolio.cs class asserting different possible scenarios

Related Issue

Closes #4863

Motivation and Context

With these changes, the class MaximumDrawdownPercentPortfolio.cs will be covered by unit tests

Requires Documentation Change

N/A

How Has This Been Tested?

I created unit tests asserting the risk model worked in the following scenarios:

• When the drawdown percent is close to the maximum drawdown percent set but not bigger
• When the maximum drawdown percent was reached so that the risk model is reset
• When there are more than one target symbol to be canceled by the risk model
• When target symbols to be canceled by the risk model is empty

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• 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.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>

[Martin-Molinero]

Thank you 👍