Move respond events and metrics to platform_insights
What does this MR do and why?
gitlab-com/www-gitlab-com!135486 (merged) moved ownership of grouprespond feature categories to groupplatform insights .
This MR updates all event & metric definitions to reflect this change. The diff was generated using scripts/internal_events/product_group_renamer.rb respond platform_insights
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Related slack discussion: https://gitlab.slack.com/archives/C072281EM5E/p1728461016165869
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Edited by Sarah Yasonik