Add sync operation support to Kolibri plugins with migration for exam logs

[bjester]

Summary

• Adds support for defining Morango sync operations on a per plugin basis
• Adds Kolibri version information to Morango instance data shared during sync
• Establishes guidelines for deciding whether to use a sync hook or a sync operation
• Reorganizes existing sync hooks/operations to align with new guidelines
• Re-enables syncing of exams for single-user devices
• Adds new sync operation to migrate exam logs when syncing full facilities from older Kolibris
• Adds and updates Morango integration tests

References

Resolves #8481
Resolves #8487

Reviewer guidance

Note: notification generation post-sync hasn't yet been updated for new log structure

• Test full facility sync with Kolibri version < 0.15 and verify exam logs
• Single user syncing of exams and related logs

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[rtibbles]

Looking good - one comment on a comment, any blockers from your side?

[rtibbles]

Read through looks good, one update needed for the notification generation.

[rtibbles]

Realizing that this won't handle updated ExamAttemptLogs that are associated with an otherwise unchanged ExamLog. Let's file this as a follow up issue that I can tackle.

[pcenov]

@bjester today I tested the Buildkite builds for this one and found some quiz related syncing issues. I was wondering whether you are aware of these:

1. When there is a Quiz completed by a Learner on a learner only device the Coach is not able to see the scores of the learner and questions answered:

2. I imported a full 0.14 facility to a 0.15 one and synced it. When I go to check the scores of a learner as a Coach the page with the quiz scores is not displayed and there's an error in the console: Uncaught (in promise) TypeError: currentAttempt.interaction_history.filter is not a function