Change SkipStatusCodePagesAttribute to inherit from IAlwaysRunResultFilter

[huan086]

Summary of the changes

• Change SkipStatusCodePagesAttribute to inherit from IAlwaysRunResultFilter instead of IResourceFilter
• Add IOrderedFilter to SkipStatusCodePagesAttribute so that callers can ensure it executes first

Addresses #10317

[dnfclas]

All CLA requirements met.

[pranavkm]

While I think this change makes sense, this does

a) is a breaking change
b) does not work with endpoint routing

We should leave the IResourceFilter on there since it does not hurt to invoke the filter in multiple stages and allows it to be non-breaking. In addition, as of 3.0, Auth happens as part of the middleware pipeline, so this change really doesn't help there. If you'd like to solve it for the latter, one solution would be to:

a) Introduce an ISkipStatusCodePagesMetadata
b) Use the presence of the metadata to skip the status code page if you're doing endpoint routing. Here's a similar pattern: https://github.com/aspnet/AspNetCore/blob/master/src/Middleware/CORS/src/Infrastructure/CorsMiddleware.cs#L140-L159

[pranavkm]

If you want to consider skipping solving this for endpoint metadata, let me know and I can file a separate issue to track it. cc @JamesNK \ @rynowak \ @Tratcher

[huan086]

Cool, let me revert the changes and follow the way CorsMiddleware does it

[mkArtakMSFT]

Thanks for your effort, @huan086 .
Do you plan to resolve @pranavkm 's comments here, or should this be closed?

[huan086]

I haven't have the time to make the necessary changes yet

[pranavkm]

Feel free to re-send this PR once you've had a chance to update it per PR comments.