Profile follow client events (#9385)
* Add parameters to profile:follow
Track who was followed, whose profile generated the follow, and the position of the person who was followed in the list
* Add profileCard:seen event
* Don't send "profileCard:seen" event to Statsig
* Clean up
* prevent overzealous clearing
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Co-authored-by: Samuel Newman <mozzius@protonmail.com>
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