Add guide - Managing global endpoint session tokens

[vkumbha]

Guide purpose
Add a guide on how to opt-in a new region and manage global endpoint session tokens

Reference: Managing global endpoint session tokens

Target audience
Specify who this guide is intended for (e.g., beginners, advanced users, specific roles).

Categories
Proposed primary category and categories where this guide would fit best. (e.g., Getting Started, Best Practices, Troubleshooting, Concepts etc).

Outline
A brief outline of the main sections or topics the guide will cover.

[rajlearner17]

@vkumbha can you point me the required data or place where you made changes? We can try something quick small guide for it.

[github-actions]

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