CI Tests

Add `FileContext.GetText(IFileRange)` overload #1217

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Run time

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Job	Run time
dotnet (ubuntu-latest)	4m 51s
dotnet (macos-latest)	4m 53s
dotnet (windows-latest)	8m 16s
dotnet (windows-latest)	12m 15s
dotnet (macos-latest)	4m 53s
dotnet (ubuntu-latest)	4m 51s
	39m 59s