Fix automation to update experimental json files in GitHub action

[adityapatwardhan]

PR Summary

Create a GitHub action to run daily and create PR for updating json files for experimental features

PR Context

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
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  • Not Applicable
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  • Documentation needed
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• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
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    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
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    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
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This PR has 92 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Small
Size       : +69 -23
Percentile : 36.8%

Total files changed: 1

Change summary by file extension:
.yml : +69 -23

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[iSazonov]

for generating powershell.config.json

Why do we generate the file at all? If I understand correctly we need to explicitly turn on all experimental features in preview builds and turn off (that is default) all experimental features in release builds.
To implement this we have no needs so complicate and could implement the logic in C# code because PowerShell know whether it is preview or release version (see $PSVersionTable.PSVersion.PreReleaseLabel).

if "ExperimentalFeatures" presents in config file than process it
else if Release version than disable all experimental features
else it is preview version and we enable all all experimental features

[daxian-dbw]

I think @iSazonov has a good point. If we enforce this in code, then there is no need to manipulate the JSON files in our build.

[daxian-dbw]

There is no harm to use the pre-populated experimental feature list for now. If the code change is done in future, we can easily move away from it.

[adityapatwardhan]

I also like the idea from @iSazonov for PS to make the decision to enable / disable. We could do that as followup. This work will unblock the issues on alpine for next preview.

[ghost]

🎉v7.3.0-preview.2 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes