Updated Native API docs with new UpdateNativeApiDocs.ps1 script

[jonthysell]

Description

This PR updates the API docs under /docs/native-api/ using a new script: .github/scripts/UpdateNativeApiDocs.ps1 which merges the Old and New Architecture docs generated from a given CI build Id.

Example usage: .\.github\scripts\UpdateNativeApiDocs.ps1 621436

This PR also cleans up various links that don't work in the docs generated by winmd2md:

• Links to local enum type values don't work asklar/winmd2md#6
• Generated links assume UWP docs even for WinAppSDK types asklar/winmd2md#7
• Generated UWP links for external types go to older docs domain, not the new learn domain asklar/winmd2md#8
• Links to internal types (but different internal namespace) instead resolve as external URLs asklar/winmd2md#9
• Generated index page picks a single (random) namespace to generate types for asklar/winmd2md#10

Why

Our docs did not including the new types we created in the New Architecture binaries, nor specify the differences between APIs for New and Old Architecture.

Screenshots

N/A

Microsoft Reviewers: Open in CodeFlow

[TatianaKapos]

LGTM, love the script!