Document CS environment variable deprecations
What does this MR do and why?
We are replacing (#357264 (closed)) a number of Container Scanning environment variables that carry an association to Docker.
This MR substitutes the deprecated variables with their successors and adds a deprecations table.
See:
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #357264 (closed)