[UWP/WinUI3 Renderer] Consolidate Xaml IDLs

[krschau]

Related Issue

#5888

Description

The ObjectModel and Rendering IDLs for UWP and WinUI3 are essentially the same, but were separated out into separate files. This change replaces these separate IDLs with shared IDLs in the Shared projects. Combining them and having one file that works for both types of Xaml will ensure that the two OMs and Renderers stay in sync.

How Verified

Build/pipelines.

Microsoft Reviewers: Open in CodeFlow

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Hi @krschau. This pull request has had no recent activity for the past 5 days . Please take the necessary actions (review, address feedback or commit if reviewed already) to move this along.

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Hi @krschau. This pull request has had no recent activity for the past 5 days . Please take the necessary actions (review, address feedback or commit if reviewed already) to move this along.

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Staleness reset by krschau

[microsoft-github-policy-service]

Hi @krschau. This pull request has had no recent activity for the past 5 days . Please take the necessary actions (review, address feedback or commit if reviewed already) to move this along.

[microsoft-github-policy-service]

Hi @krschau. This pull request has had no recent activity for the past 5 days . Please take the necessary actions (review, address feedback or commit if reviewed already) to move this along.