### Description
<!-- Describe your changes. -->
Update various test projects to .net8 from EOL frameworks.
Replace the Xamarin based Android and iOS test projects with a MAUI
based project that uses .net 8.
Add new CoreML flags to C# bindings
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Remove usage of EOL frameworks.
### Description
<!-- Describe your changes. -->
Xamarin is EOL so remove support.
The MAUI targets are EOL and need updating.
https://dotnet.microsoft.com/en-us/platform/support/policy/maui
Other cleanups:
- netcoreapp3.1 is EOL
- the net6 macos target was added in the mistaken belief that was for
MAUI mac support, but that is actually via the mac-catalyst target which
we recently added support for.
- some CIs that were using the old build setup of splitting pre-net6
targets. The ORT C# bindings csproj was updated last year and the
`PreNet6` and `SelectedTargets` properties no longer exist as they were
replaced by the simpler `IncludeMobileTargets` property.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Remove EOL components.
#21058
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Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from
13.0.1 to 13.0.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/JamesNK/Newtonsoft.Json/releases">Newtonsoft.Json's
releases</a>.</em></p>
<blockquote>
<h2>13.0.2</h2>
<ul>
<li>New feature - Add support for DateOnly and TimeOnly</li>
<li>New feature - Add UnixDateTimeConverter.AllowPreEpoch property</li>
<li>New feature - Add copy constructor to JsonSerializerSettings</li>
<li>New feature - Add JsonCloneSettings with property to disable copying
annotations</li>
<li>Change - Add nullable annotation to JToken.ToObject(Type,
JsonSerializer)</li>
<li>Change - Reduced allocations by reusing boxed values</li>
<li>Fix - Fixed MaxDepth when used with ToObject inside of a
JsonConverter</li>
<li>Fix - Fixed deserializing mismatched JToken types in properties</li>
<li>Fix - Fixed merging enumerable content and validate content</li>
<li>Fix - Fixed using $type with arrays of more than two dimensions</li>
<li>Fix - Fixed rare race condition in name table when deserializing on
device with ARM processors</li>
<li>Fix - Fixed deserializing via constructor with ignored base type
properties</li>
<li>Fix - Fixed MaxDepth not being used with ISerializable
deserialization</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="4fba53a324"><code>4fba53a</code></a>
Remove prerelease for 13.0.2</li>
<li><a
href="b15df4b50d"><code>b15df4b</code></a>
Add missing headers</li>
<li><a
href="789bfd3bbc"><code>789bfd3</code></a>
Update to 13.0.2-beta3</li>
<li><a
href="b13717a1c1"><code>b13717a</code></a>
Add JsonCloneSettings to disable copy annotations (<a
href="https://github-redirect.dependabot.com/JamesNK/Newtonsoft.Json/issues/2757">#2757</a>)</li>
<li><a
href="d0a328e8a4"><code>d0a328e</code></a>
Fix MaxDepth not being used with ISerializable deserialization (<a
href="https://github-redirect.dependabot.com/JamesNK/Newtonsoft.Json/issues/2736">#2736</a>)</li>
<li><a
href="aae9284e20"><code>aae9284</code></a>
Update SDK</li>
<li><a
href="bd989708b1"><code>bd98970</code></a>
Update to 13.0.2-beta2</li>
<li><a
href="4dc9af66e0"><code>4dc9af6</code></a>
Add roll forward to global.json (<a
href="https://github-redirect.dependabot.com/JamesNK/Newtonsoft.Json/issues/2726">#2726</a>)</li>
<li><a
href="b8f4ef0f98"><code>b8f4ef0</code></a>
Fixing misspelling (<a
href="https://github-redirect.dependabot.com/JamesNK/Newtonsoft.Json/issues/2698">#2698</a>)</li>
<li><a
href="cb9eed9666"><code>cb9eed9</code></a>
Fix deserializing via constructor with ignored base type properties (<a
href="https://github-redirect.dependabot.com/JamesNK/Newtonsoft.Json/issues/2711">#2711</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/JamesNK/Newtonsoft.Json/compare/13.0.1...13.0.2">compare
view</a></li>
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Add Xamarin support to the ORT nuget packages.
- Update C# code to support Xamarin builds for iOS and Android
- refactor some things to split out common code
- include iOS and Android ORT native shared library in native nuget package
