Visual Studio for Mac v2.8.0.16-vsm17.3

What's Changed

• [VSMac] Switch macOS build to net6 by @nosami in #2963
• Push MS.VS.Threading into VimCore by @jaredpar in #2973
• Initial Actions work by @jaredpar in #2977
• Publish steps by @jaredpar in #2978
• Mac OS Publishing by @jaredpar in #2979
• Merge in GitHub Action support by @jaredpar in #2980
• Update README Build Badge by @jaredpar in #2981

Full Changelog: v2.8.0.15-vsm17.0...v2.8.0.16-vsm17.3