Addition of not responded posts filter in fetch threads lists API.

[mehaknasir]

Addition of not responded posts filter in fetch threads lists API.

Description

Addition of not responded posts filter in fetch threads lists API.
Jira ticket: https://2u-internal.atlassian.net/browse/INF-524
related FE PR: openedx/frontend-app-discussions#286

Useful information to include:

• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author".

Supporting information

Jira ticket: https://2u-internal.atlassian.net/browse/INF-524
related FE PR: openedx/frontend-app-discussions#286

Testing instructions

• checkout to this branch and make sure you have the latest changes from cs_comment_service as well
• use mehak/INF-475 branch of discussions MFE
• run devstack and open the filters section in all posts/ and my posts
• select not responded from the filters section now scroll through the list and. it should display a list of all such discussion posts which have not been responded to.
• Click load more posts to validate no such posts are returned in paginated response as well.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.