Revert "TW-60115 "A plugin was not found at path plugins\nuget-agent\bin\credential-plugin\netcoreapp3.0\CredentialProvider.TeamCity.dll" if only dotnet version 3.0 is installed on an agent"
Revert "TW-60115 "A plugin was not found at path plugins\nuget-agent\bin\credential-plugin\netcoreapp3.0\CredentialProvider.TeamCity.dll" if only dotnet version 3.0 is installed on an agent"

This reverts commit bbb3e39a58ae831c8c03b725e316523abecc158f.

JetBrains/teamcity-nuget-support,JetBrains/teamcity-nuget-support,JetBrains/teamcity-nuget-support,JetBrains/teamcity-nuget-support