Clean up customer_relations feature flag
What does this MR do and why?
Related to #346082 (closed)
Screenshots or screen recordings
Remove code references to :customer_relations
feature flag.
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.
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I have evaluated the MR acceptance checklist for this MR.
Related to #346082 (closed)