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insights: skip get insights calls when insight card is not visible

Administrator requested to merge cw/re-enable-polling-when-visible into main

Created by: chwarwick

This re-enables insight polling by default but only polls when the insight card is visible. I also slightly slowed down the polling rate.

Some notes: stopPolling is safe to call as often as you want it's a noop if you are not polling startPolling if called multiple time causes the previous interval to get canceled a new one to start, so we need to be careful not to call it over and over.

resolves https://github.com/sourcegraph/sourcegraph/issues/38425

Test plan

  • Created 3 rows of insights (one permanently in a processing state) and shrunk screen so that only 1 row was visible at a time
  • Scrolled and monitored that network requests occurred when row appeared
  • Verified polling stoped when insight left screen and resumed when it reentered
  • Verified changing filter and sorting values correctly updated ui
  • Verified setting insight-polling-enabled = false ensured that no polling occurred.

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