🐞 InternalManifest IEquatable does not validate internal structure of manifest

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

equality only checks that gpunit size contest size and ballot style size match but does not inspect the equality of each colection member.

### Expected Behavior

equality should check all members

```csharp
if (!isEqual)
{
return isEqual;
}

for (ulong i = 0; i < GeopoliticalUnitsSize; i++)
{
isEqual = isEqual && GetGeopoliticalUnitAtIndex(i).Equals(other.GetGeopoliticalUnitAtIndex(i));
}

for (ulong i = 0; i < ContestsSize; i++)
{
isEqual = isEqual && GetContestAtIndex(i).Equals(other.GetContestAtIndex(i));
}

for (ulong i = 0; i < BallotStylesSize; i++)
{
isEqual = isEqual && GetBallotStyleAtIndex(i).Equals(other.GetBallotStyleAtIndex(i));
}
```

### Steps To Reproduce

_No response_

### Environment

```markdown
- OS:
```

### Anything else?

_No response_