[Bug] ValueTuple<T1, T2> is not converted to links when using "outputFormat": "mref"

[filzrev]

Describe the bug
When using "outputFormat": "mref" setting.
ValueTuple<T1, T2> cref DocComment is not resolved to link.

To Reproduce
Steps to reproduce the behavior:

1. Initialize docfx project and configure to include C# source code.
2. Add following property to source code.

   /// <summary>
   /// - <see cref="System.ValueTuple" />
   /// - <see cref="System.ValueTuple{T}" />
   /// - <see cref="System.ValueTuple{_}" />
   /// - <see cref="System.ValueTuple{T1,T2}" />
   /// - <see cref="System.ValueTuple{_,_}" />
   /// - <see cref="System.Collections.Generic.Dictionary{_,_}" />
   /// </summary>
   public static class DummyClass
   {
   }

3. Run docfx metadata command
4. Run docfx build --serve command and confirm generated HTML
5. Following cref links are rendered as plain text (<span class="xref">(T1, T2)</span>).
   5.1. <see cref="System.ValueTuple{T1,T2}" />
   5.2. <see cref="System.ValueTuple{_,_}" />

It seems caused by SymbolDisplay.ToDisplayParts Roslyn API returns custom ImmutableArray<SymbolDisplayPart> that don't contains href URL.

Generated yaml for ValueTuple<T1>

- uid: System.ValueTuple`1
  commentId: T:System.ValueTuple`1
  isExternal: true
  href: https://learn.microsoft.com/dotnet/api/system.valuetuple-1
  name: ValueTuple<T1>
  nameWithType: ValueTuple<T1>
  fullName: System.ValueTuple<T1>
  spec.csharp:
  - uid: System.ValueTuple`1
    name: ValueTuple
    isExternal: true
    href: https://learn.microsoft.com/dotnet/api/system.valuetuple-1
  - name: <
  - name: T1
  - name: '>'

Generated yaml for ValueTuple<T1,T2> (href link is missing)

- uid: System.ValueTuple`2
  commentId: T:System.ValueTuple`2
  name: (T1, T2)
  nameWithType: (T1, T2)
  fullName: (T1, T2)
  spec.csharp:
  - name: (
  - name: T1
  - name: ','
  - name: " "
  - name: T2
  - name: )
  spec.vb:
  - name: (
  - name: T1
  - name: ','
  - name: " "
  - name: T2
  - name: )

Expected behavior
ValueTuple<T1,T2> is rendered as link.