Upgrade to .NET 8

What's Changed

• Bump xunit from 2.6.1 to 2.6.2 by @dependabot in #533
• Bump xunit.runner.visualstudio from 2.5.3 to 2.5.4 by @dependabot in #532
• Bump xunit from 2.6.2 to 2.6.3 by @dependabot in #536
• Bump Moq from 4.20.69 to 4.20.70 by @dependabot in #535
• Bump DynamicData from 8.1.1 to 8.3.27 by @dependabot in #537
• Bump xunit.runner.visualstudio from 2.5.4 to 2.5.5 by @dependabot in #534
• Remove moq by @Lolle2000la in #538
• Add UI tests step by @Lolle2000la in #539

Full Changelog: v2.12.6...v2.12.7