Christopher Lee

EG-43: Cache catalog query contains call

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This PR will cache the response from CatalogQueryContainsViewSet from the course-discovery IDA. https://openedx.atlassian.net/browse/EG-43 https://rpm.newrelic.com/accounts/88178/key_transactions/35300/x_rays/4669#id=75ca5033-f190-11e8-8af5-0242ac11000a_36532_39981&tab-detail_75ca5033-f190-11e8-8af5-0242ac11000a_36532_39981=database_queries

Added 429 exception handling

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Added 429 exception handling FYI @bbaker6225 @samgiles On the off chance you are still around, could you review this?