[TSD] add annotations for ENABLE_DISCUSSION_HOME_PANEL feature flag

[jramnai]

Description

This PR adds annotaions for ENABLE_DISCUSSION_HOME_PANEL feature flag.

Supporting information

https://github.com/edx/edx-platform/pull/520

This feature flag is False in lms/envs/common.py but from the ansible config its value is True by default, that's why I have added toggle_default as True.

[openedx-webhooks]

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[jramnai]

@natabene, I don't know why the test cases are failing, can you or anybody else help me with it?

[natabene]

@jramnai Thank you for your contribution! @eLRuLL @BbrSofiane Would you be able with tests?

[eLRuLL]

👍 this looks good to merge @edx/doc-a-thon-reviewers

@jramnai looks like a temporary failure, maybe try rerunning this (push again?)

[jramnai]

jenkins run all

[edx-status-bot]

Your PR has finished running tests. There were no failures.

[openedx-webhooks]

@jramnai 🎉 Your pull request was merged!

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[felipemontoya]

Thanks @jramnai @natabene @eLRuLL 👍 👍 👍 👍

[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.

[natabene]

@felipemontoya @eLRuLL Thank you so much!