Feature: support ComboLimit Order type in TastyTrade and refactor BrokerageTests

[Romazes]

Description

Refactored the abstract class BrokerageTests to extend support for combo order types. The refactor allows developers to leverage generic test cases from Lean for their brokerage consumers, enabling independent testing of order logic.

Related Issue

N/A

Related PRs

• Feature: support ComboLimitOrder Lean.Brokerages.Tastytrade#13

Motivation and Context

Previously, BrokerageTests had limited support for testing different order types, making it cumbersome for developers to validate combo orders in their custom brokerage implementations. This refactor streamlines the process, improving test coverage and reducing boilerplate code.

Requires Documentation Change

N/A

How Has This Been Tested?

• Verified that existing single order type tests continue to pass. (I have test in InteractiveBrokers)

• Added and executed new tests for combo order scenarios. (in https://github.com/QuantConnect/Lean.brokerages.InteractiveBrokers)

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!