[Feature]: DxeCore Host-Based Unit Test

### Feature Overview

DxeCore could use a dedicated host-based unit test for verifying routines within.

### Solution Overview

[MemoryProtectionUnitTestHost](https://github.com/microsoft/mu_basecore/blob/release/202302/MdeModulePkg/Core/Dxe/UnitTest/MemoryProtectionUnitTestHost.inf) is a copy of DxeCore and is testing some logic embedded within. This unit test should be renamed DxeCoreUnitTestHost so we can add new tests piecemeal.

### Alternatives Considered

It also may be worth investigating if gMock can be used to simplify this host-based test.

### Urgency

Low

### Are you going to implement the feature request?

I will implement the feature

### Do you need maintainer feedback?

No maintainer feedback needed

### Anything else?

_No response_