* [release/5.0] Clean out Ubuntu 16.04 testing
- cherry-pick of #32894
* Clean out Ubuntu 16.04 testing
- use Ubuntu 18.04 agents for testing in Docker containers on Helix
- also move to supported version of Fedora
* Support added `msbuild` arguments in RunHelix.ps1
- bring in part of 0551cef40f5f (#32554)
- no reason to maintain major differences from main version of script
- slight difference is we still test on Windows.10.Amd64.Open by default here
nits:
- clean up a few old mentions of Centos and Fedora testing
- fix `%(Platform)` metadata for OSX `@(HelixAvailableTargetQueue)` items
- pick up a small bit of the master -> main renaming improvements
- use `[switch]` instead of `[bool]` in RunHelix.ps1 parameters
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