[release/8.0.1xx] [msbuild] Copy files to be signed into the correct directory for Hot Restart. Fixes #19278.

[vs-mobiletools-engineering-service2]

1. Move the signing to after we copy files that must be signed into the app bundle
   that will be signed: we sign in the _CodesignHotRestartAppBundle target, so this
   means the targets _CopyHotRestartBundleResources and _CopyFilesToHotRestartSignedAppDirContents
   must execute first.

2. Try to clear up some confusion about the directories involved. The HotRestartSignedAppOutputDir
   property indicates the location of the signed app bundle, which means no files
   should be added there. Instead files that should be signed (or present when the
   app launches) must be placed in the HotRestartAppBundlePath directory.

3. Document each property involved to try to avoid more mistakes in the future.

Fixes #19278.

Backport of #19302

[rolfbjarne]

/azp run

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.NET (No breaking changes)

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• MacCatalyst: vsdrops gist (No breaking changes)
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• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

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