Add API review team as a code owner for PublicAPI (#28155)

No idea if this actually works, but giving it a try

Author: pranavkm

.github/CODEOWNERS

@@ -8,6 +8,7 @@
 /eng/common/                    @dotnet-maestro-bot
 /eng/Versions.props             @dotnet-maestro-bot @dougbu
 /eng/Version.Details.xml        @dotnet-maestro-bot @dougbu
+PublicAPI.Unshipped.txt         @dotnet/aspnet-api-review
 /src/Components/                @SteveSandersonMS @dotnet/aspnet-blazor-eng
 /src/DefaultBuilder/            @tratcher
 /src/Hosting/                   @tratcher
@@ -16,7 +17,7 @@
 /src/Middleware/                @tratcher
 /src/Middleware/HttpsPolicy/    @jkotalik
 /src/Middleware/Rewrite/        @jkotalik
-# /src/ProjectTemplates/        @ryanbrandenburg
+/src/Mvc/                       @pranavkm @javiercn
 /src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/  @dotnet/aspnet-blazor-eng
 /src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/  @dotnet/aspnet-blazor-eng
 /src/Security/                  @tratcher