ci: Fix versioning in package deployment (v3)

[DaveSkender]

Important

Don't merge here, this is just for troubleshooting v3 preview increments. Move to:

• ci: Fix version parser #1303

Ref: GitVersion configuration and variables docs

• try again with built-in tasks. the error was I was using -c instead of -config for path
• conditionally use prerelease gitversion variable
• fix: load GitVersion vars to env
• review workflow: GitHubFlow/v1
• ensure NO_ENVIRONMENT is not created, or use “”

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• .vscode/settings.json: Language not supported

[DaveSkender]

Steps to add locally:

1. Install tool from repo folder (can also install globally)

   dotnet new tool-manifest
   dotnet tool install GitVersion.Tool --version 6.0.5

2. Show configuration

   # both of these work
   dotnet-gitversion -c src/gitversion.yml -showconfig
   dotnet gitversion -c src/gitversion.yml -showconfig

3. Run diagnostics

   dotnet gitversion -diag -config src/gitversion.yml