Merge release 6.1 into dev (#2636)

* update env toggle for staging and prod (#2454)

* increase max subsegment depth to 8 (#2462)

* remove joins from findOneSegmentByContextAndType (#2467)

* skip duplicate check for private segments on upsert (#2472)

* put changelog.md for release notes in repo (#2463)

* remove sorting by status from global exclude list (#2476)

* Exclude user with no working group data if there are global group excludes (#2502)

* Auto-remove leading/trailing spaces from user-entered payloads (#2534)

* Feature/ff ephemeral user options (#2556)

* ephemeral ff user groups and remove exposure id FK constraint

* ephemeral ff user groups and remove exposure id FK constraint

* remove comment from ff-exposure model

* use same language in usercheck middleware docs as swagger

* mooclet configs on for staging (#2565)

* recommit

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Co-authored-by: Ben Blanchard <bblanchard@carnegielearning.com>
Co-authored-by: Zack Lee <90279765+zackcl@users.noreply.github.com>

Author: 3 people