[Bug] globalNamespaceID and filter yml filter all API in a project regardless of namespace

**Describe the bug**
Using the following metadata settings in my config file:
```
"filter": "filter.yml",
"globalNamespaceID": "Global Namespace"
```

And the following rule in my filter config:
```
apiRules:
- exclude:
uidRegex: ^Global Namespace.*
type: Namespace
```

Causes all API to be filtered out of my project, across all namespaces.

**To Reproduce**
Steps to reproduce the behavior:
1. Unzip [docfx_project.zip](https://github.com/dotnet/docfx/files/12928209/docfx_project.zip)
2. Build it.

**Expected behavior**
ClassLibrary1.Class1.xPlusOne is documented.

**Context (please complete the following information):**
- OS: Windows
- Docfx version: 2.70.0

**Additional context**
In our previous version of DocFX, 2.59.x, ClassLibrary1.Class1.xPlusOne is documented. What 2.70.0 is doing may be correct behavior, as I'm unsure of exactly what the global namespace is in the context of DocFX filtering, but this behavior change is unexpected.