Reorganize Legacy Face Samples

[der3318]

Purpose

A follow-up of #369 and https://github.com/MicrosoftDocs/azure-docs-pr/pull/281502. New samples are now published, so we are re-organizing legacy face code snippets that are not referenced anymore:

• Keep the "{Language}/Face/" root folders clean, hosting only the top and currently recommended quick start codes.
• Backup the samples written in old SDKs in a subfolder named "{Language}/Face/cognsvcsdk/".

Take C# for example:

dotnet/Face/
├── cognsvcsdk                  (snippets using old Microsoft.Azure.CognitiveServices.Vision.Face SDK)
│   ├── analyze.cs
│   ├── detect.cs
│   ├── FaceQuickstart.cs
│   ├── FaceQuickstart-single.cs
│   └── identify.cs
├── Detect.cs                   (latest Azure.AI.Vision.Face SDK demoed in official learning docs)
├── FindSimilar.cs
├── Quickstart.cs
└── rest                        (basic usage via raw HttpClient REST API)
    └── detect.cs

Also applying feedback from peers: explicitly indicating (i.e., comment and variable naming) we are interacting with "large" person group to avoid possible confusion.

Does this introduce a breaking change?

• Yes
• No

Pull Request Type

What kind of change does this Pull Request introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation content changes
• Other... Please describe:

How to Test

Visual Studio 2022 | .NET 8.0 (LTS)

$ dotnet run

Python 3.8.9

$ python Quickstart.py

OpenJS.NodeJS.LTS (Version 20.15.0)

$ node Quickstart.js