Opentelemetry-dotnet: MyGet publishing seems to be broken

[reyang]

1. Recent merges to master failed to publish MyGet package.
2. I want to bring the topic again - should we simply remove the VSO pipeline and MyGet (and use Actions to publish packages based on tags)? (I don't see many folks using MyGet packages - they give us maintenance cost without obvious benefit)

[reyang]

[cijothomas]

myget push build is broken in Azure Devops.
Lets first bring it to GHActions. Asked @eddynaka s help to get it. I can setup the myget token as a GH Secret.
And then remove it and replace with nuget daily push.

[eddynaka]

@cijothomas let me know the token name so I can set up the variables. I will try some stuff later.

[eddynaka]

@reyang , with our latest pr, the myget is working again.

Now, we go back to the questions:

• should we keep pushing to myget every time?
• should we move to nightly push to nuget?

[reyang]

Ping back from #1063.