Fix pagination user tables

[marcellamaki]

Summary

Updates handler.js for the class enrollment user management, and simplifies the vue components to better match the updates in the FacilityUsers page. Now learners should be accurately displaying in the user table for enrollment in a class.

References

Fixes #9448

Reviewer guidance

Is the pagination working as expected with > 30 users?

Also... am I supposed to be filtering out anyone not exclusively a learner? Truly cannot remember.... I think coaches and admins can still be added to classes

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[rtibbles]

Seems to make sense from an initial read through - one question though.

[radinamatic]

30< Learners are back! 🥳

Tested on Chrome & Firefox on Windows 10

And yes, filtering is only in play when assigning coaches, anybody can be a learner 🙂

[radinamatic]

LGTM! 👍🏽

[radinamatic]

Re-tested on Win 10 after the last commits by @rtibbles, 30< learner pagination still looking good, let's merge for the bugbash tomorrow!