Remove duplicated data from legacy events

When event-tracking was fully integrated into the platform, some data was replicated in the context in the middleware and then later extracted and moved the old location by event-tracking. The legacy code path was not updated to remove this transient shim data from the context resulting in duplication of the information. This patch ensures that the transient information is removed from the context before emitting the event.

Fixes: AN-2369
Allow external_auth registrations to bypass PW complexity check
Show category when an xblock does not have a default display name
Revert "Revert "Merge pull request #4545 from edx/renzo/bi-analytics-overhaul""

This reverts commit 079808ee474031e47ed7c83a61b407e5ab5bb7ab.
Fully rename instructor dashboard analytics app
new release of edx-ora2
Merge pull request #4624 from edx/db/update-ora2

new release of edx-ora2
Merge pull request #4608 from edx/benmcmorran/fix-blank-xblock-names

Show category when an xblock does not have a default display name
Downgrade scipy, lxml, boto, edx-ora2
Merge pull request #4626 from edx/db/revert-dep-upgrades

Downgrade scipy, lxml, boto, edx-ora2
Add a post/response/comment in preparation for new Question type post
Merge pull request #4483 from edx/ahodges/documentation/FOR662

Ahodges/documentation/for662
Merge pull request #4620 from edx/renzo/fix-instructor-analytics

Renzo/fix instructor analytics
Annotations Tools: Sharing Plugin Fixed with Proper URI
Annotation Tool: Fixing Table Share bug (2b)
Image Annotation Tool: Fixed Viewport Timeout Issue
Annotation Tools: Fixing Share Indentation, Grep Functions and Equality
Annotation Tools: Fixed Share button to allow selection of text box
Annotation Tools: Code clean-up, formatting, spacing
Disable css3 animations in bok-choy tests.