Remove documentation for deprecated usage_data method
What does this MR do and why?
As part of gitlab-org/analytics-section/analytics-instrumentation/internal#670 (closed) I'm trying to remove anything unnecessary from our public documentation.
The removed page describes the deprecated method for adding metrics to usage_data.rb
. We have not supported this for a long time and the only place it was linked is the deprecation message. However the other page linked there also provides a migration guide which is more helpful.
MR acceptance checklist
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