Fix xdist flakiness in test_signals.py

fetch correct target branch for diff jobs

Fixed issue where git logs aren't functioning

Use the course key as the primary key for storing coure import logs in
mongo, instead of the deprecated course key (this only applies to
courses imported via git_import.py).

No effort is made to migrate existing logs, since they are ephemeral.

Revert "Check for username retirement in validation endpoint."

Show browser support alert

OPS-3450 Migrate AWS.py to Production.py

Check for username retirement in validation endpoint.

remove paver timeout decorator

JWT Cookies

update usage of SessionAuthenticationAllowInactiveUser

LEARNER-6469

Remove waffles gating permanent checklist features

bundles on track selection

Convert instructor email messages to ACE

Registration deprecation: switch existing tests to use the newer endpoint.

Skip sending email if an email address contains non-ascii char.

Remove tools that don't seem to be used.

Use Mock environment for paver quality tests

Reduce query to user table

LEARNER-6336

[OC-3682] Implement management commands to export/import content libraries

Fix flaky mongo count test with xdist