Updated the build pipeline

Merge pull request #90 from Umplify/azure-pipelines-updated

Update azure-pipelines.yml for Azure Pipelines

Exposed `IConfigurationBuilder` interface in `TestBedFixture`

Merge pull request #89 from Umplify/issue_88

Exposed `IConfigurationBuilder` #88

The first release version of .NET 6.0 adopted

Merge pull request #86 from Umplify/issue_85

Adopted the release version of .NET 6.0 #85

Introduced GetConfigurationFiles() virtual method

Please review the comments in issue #75 for further background on this enhancement.

Bumps Microsoft.NET.Test.Sdk from 16.11.0 to 17.0.0

6.1.1

Merge pull request #74 from Umplify/dependabot/nuget/Microsoft.NET.Te…

Migrated the library to .NET 6.0 rc2

This code release is the first version of the library supporting .NET 6.0 starting at rc 2.0.

Upgraded Microsoft packages to 3.1.20

Merge pull request #71 from Umplify/issue_70

Upgraded Microsoft NuGet packages to 3.1.20 #70

Bumped Microsoft.NET.Test.Sdk from 16.10.0 to 16.11.0

1.0.68

Merge pull request #69 from Umplify/dependabot/nuget/Microsoft.NET.Te…

Upgraded Microsoft packages to 3.1.18

Merge pull request #68 from Umplify/issue_67

Upgraded Microsoft packages to 3.1.18

Bumped coverlet.collector from 3.0.3 to 3.1.0

1.0.66

Merge pull request #66 from Umplify/dependabot/nuget/coverlet.collect…