Make IScaffoldingModelFactory public

[bricelam]

Fixes #23049

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• ❔ The code builds and tests pass locally (also verified by our automated build checks)
• ❌ Commit messages follow this format:

        Summary of the changes
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        Fixes #bugnumber

• ❌ Tests for the changes have been added (for bug fixes / features)
• ✔️ Code follows the same patterns and style as existing code in this repo

[bricelam]

@AndriySvyryd Is there a reason the PR template isn't an HTML comment anymore? As you can see above, this broke my highly streamlined workflow. 😉 But since it showed up, I took the time to fill it out...

[ghost]

Hello @bricelam!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[AndriySvyryd]

@bricelam This makes it clear whether the author actually read it.

[ghost]

Apologies, while this PR appears ready to be merged, I've been configured to only merge when all checks have explicitly passed. The following integrations have not reported any progress on their checks and are blocking auto-merge:

1. Azure Pipelines

These integrations are possibly never going to report a check, and unblocking auto-merge likely requires a human being to update my configuration to exempt these integrations from requiring a passing check.

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