Add postfiltering logging to api/issues

Jayrequested to merge
jswain_postfiltering_logging into master

What does this MR do and why?

Add postfiltering logging to api/issues

Lets collect postfiltering performance and prefiltering accuracy data to help guide us where to invest in our authorization efforts.

  • introduce postfilter_logging flag
  • introduce PostfilteringHelpers

part of: https://gitlab.com/gitlab-org/gitlab/-/work_items/581753

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