the the fields session_id and user_id to Measurement Protocol payload

[kingman]

Description

Please provide a description of the changes you have made in this PR.

How has this been tested?

Please explain how you have tested the new changes.

Checklist

• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have successfully run the E2E tests, and have included the links to the pipeline runs below
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] I have updated any relevant documentation to reflect my changes
• [ ] I have assigned a reviewer and messaged them

Pipeline run links:

[kingman]

1. See comment in file.
2. Pls write code documentation.

Just add documentation for the updated payload in the activation.md file