Catch HttpError thrown by Python Social Auth.

This patch enables catching HttpError exception raised
by PSA because of any issue caused at client/server.
Further it redirects user to login page with a
message about the error.

LEARNER-4344

Remove this flaky test.

update studio-frontend version to 1.8.0

request cache some more stuff

Optimize dictionary combination

retrap focus for seat unenroll survey a11y

learner-4715

Cache get_group_id_for_user

learner-4715

LEARNER-4700: Converts credentials to plugin

Updates to use the is_anonymous flag of basket calculate

[LEARNER-4913]

Update retirement APIs to match spec

LEARNER-4880 added confirmation modal for account deletion

Yro/EDUCATOR 2700

make userorgtag deletable

UnregisteredLearnerCohortAssignments can retire users.

Prepend unicode signature (BOM) to csv reports

Changes the DeletableByUserValue delete algorithm.

Update support form.

TE-2546 Remove obsolete requirements files

Yro/EDUCATOR 2644

ENT-945 Apply logic for taking into account SSOVerifications

asadiqbal08- ENT-645 - Enterprise version bump 

[ENT-645]- Updated the messages when a learner leave an organization.

for MS Excel 2013 compatibility

Changing the contact-us link