Revert "Adding commandline API"

[tdykstra]

Reverts #7859

[opbld31]

Docs Build status updates of commit 696b1d2:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/FrameworksIndex/system-commandline.xml	✅Succeeded
xml/System.CommandLine.Binding/BinderBase`1.xml	✅Succeeded
xml/System.CommandLine.Binding/BindingContext.xml	✅Succeeded
xml/System.CommandLine.Binding/BoundValue.xml	✅Succeeded
xml/System.CommandLine.Binding/IValueDescriptor.xml	✅Succeeded
xml/System.CommandLine.Binding/IValueDescriptor`1.xml	✅Succeeded
xml/System.CommandLine.Binding/IValueSource.xml	✅Succeeded
xml/System.CommandLine.Builder/CommandLineBuilder.xml	✅Succeeded
xml/System.CommandLine.Builder/CommandLineBuilderExtensions.xml	✅Succeeded
xml/System.CommandLine.Completions/CompletionContext.xml	✅Succeeded
xml/System.CommandLine.Completions/CompletionDelegate.xml	✅Succeeded
xml/System.CommandLine.Completions/CompletionItem.xml	✅Succeeded
xml/System.CommandLine.Completions/ICompletionSource.xml	✅Succeeded
xml/System.CommandLine.Completions/TextCompletionContext.xml	✅Succeeded
xml/System.CommandLine.Completions/TokenCompletionContext.xml	✅Succeeded
xml/System.CommandLine.Help/HelpBuilder+Default.xml	✅Succeeded
xml/System.CommandLine.Help/HelpBuilder.xml	✅Succeeded
xml/System.CommandLine.Help/HelpBuilderExtensions.xml	✅Succeeded
xml/System.CommandLine.Help/HelpContext.xml	✅Succeeded
xml/System.CommandLine.Help/HelpSectionDelegate.xml	✅Succeeded
xml/System.CommandLine.Help/TwoColumnHelpRow.xml	✅Succeeded
xml/System.CommandLine.IO/IStandardError.xml	✅Succeeded
xml/System.CommandLine.IO/IStandardIn.xml	✅Succeeded
xml/System.CommandLine.IO/IStandardOut.xml	✅Succeeded
xml/System.CommandLine.IO/IStandardStreamWriter.xml	✅Succeeded
xml/System.CommandLine.IO/StandardStreamWriter.xml	✅Succeeded
xml/System.CommandLine.IO/SystemConsole.xml	✅Succeeded
xml/System.CommandLine.IO/TestConsole.xml	✅Succeeded
xml/System.CommandLine.Invocation/ICommandHandler.xml	✅Succeeded
xml/System.CommandLine.Invocation/IInvocationResult.xml	✅Succeeded
xml/System.CommandLine.Invocation/InvocationContext.xml	✅Succeeded
xml/System.CommandLine.Invocation/InvocationMiddleware.xml	✅Succeeded
xml/System.CommandLine.Invocation/MiddlewareOrder.xml	✅Succeeded
xml/System.CommandLine.Parsing/ArgumentResult.xml	✅Succeeded
xml/System.CommandLine.Parsing/CommandLineStringSplitter.xml	✅Succeeded
xml/System.CommandLine.Parsing/CommandResult.xml	✅Succeeded
xml/System.CommandLine.Parsing/OptionResult.xml	✅Succeeded
xml/System.CommandLine.Parsing/ParseArgument`1.xml	✅Succeeded
xml/System.CommandLine.Parsing/ParseError.xml	✅Succeeded
xml/System.CommandLine.Parsing/ParseResult.xml	✅Succeeded
xml/System.CommandLine.Parsing/ParseResultExtensions.xml	✅Succeeded
xml/System.CommandLine.Parsing/Parser.xml	✅Succeeded
xml/System.CommandLine.Parsing/ParserExtensions.xml	✅Succeeded
xml/System.CommandLine.Parsing/ResponseFileHandling.xml	✅Succeeded
xml/System.CommandLine.Parsing/SymbolResult.xml	✅Succeeded
xml/System.CommandLine.Parsing/Token.xml	✅Succeeded
xml/System.CommandLine.Parsing/TokenType.xml	✅Succeeded
xml/System.CommandLine.Parsing/TokenizeError.xml	✅Succeeded
xml/System.CommandLine.Parsing/ValidateSymbolResult`1.xml	✅Succeeded
xml/System.CommandLine/Argument.xml	✅Succeeded

This comment lists only the first 50 files in the pull request.
For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel