Fix 4/4 of CA2201 warnings

[Marinovsky]

Description

Fix 4/4 of CA2201 warnings creating a new class called TestException

CA2201: Do not raise reserved exception types (see https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

Related Issue

Partially closes #5155

Motivation and Context

With this change LEAN will have less CA2201 warnings

Requires Documentation Change

N/A

How Has This Been Tested?

N/A

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 👍