[#3948] Update dotnet samples to target .Net 8 - Advanced samples #3985
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Addresses #3948
#minor
Important
These changes depend on PR #3982 being merged, so the CI pipeline pass successfully with .NET 8.
Description
This PR updates the Advanced samples to target .NET 8.
Specific Changes
Testing
These images show the updated bots working as expected.
01.console-echo
16.proactive-messages
17.multilingual-bot
19.custom-dialogs
21.corebot-app-insights
23.facebook-events
42.scaleout
44.prompt-users-for-input
47.inspection