Edx-proctoring

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* Fix bug with StudentProctoredExamAttempt put handler where course_id was being incorrectly determined,
preventing course staff from marking learners' attempts as "ready_to_resume".

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* Add more useful attributes to log messages, in a key=value format that is easier to extract, and reduce
duplicate exception logs.
* Update private.txt file path in developer docs

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* Show "approved in other course" status for learner who has a valid verified onboarding attempt in another course,
on the instructor's student onboarding status panel

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* Change use of get_active_enrollments_by_course method of the LMS Enrollments service to
get_enrollments_can_take_proctored_exams, which is more performant. This shifts the responsibility
of checking learners' ability to access proctored exams to the LMS, allowing the LMS to construst a
bulk query for all learners in a course with active enrollments instead of needing to execute multiple
queries on a per learner basis.

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* Refactor the proctoring API function to get all verified onboarding attempts of a group of learners.

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* Update table on instructors dashboard to add accordian for multiple attempts