Verify Azure function app works with .NET 5.0 target framework

[ashpatil-msft]

Brief description of your issue

I noticed an error about missing dll on the Azure function app when I published from visual studio. The current azure function targets .NET 5.0. After switching to .NET Core 3.1 and re-publishing it, the function app worked fine.
Need to investigate if azure function app is behaving as expected with .NET 5.0.

Steps to reproduce

Expected behavior

Actual behavior

Environment