Document the SDLC of a components repository

What does this MR do and why?

Related to Backend: Testing components in CI (#387291 - closed)

In this MR I describe a full Software Development Life Cycle for an example of components repository. This document is nested to the architecture blueprint of CI catalog.

Eventually we can convert this material to a user documentation.

See the video: CI Components - development workflow.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.