feat: [FC-0044] refactoring xblock actions

[ruzniaievdm]

Description

Each xblock component’s three dots menu on the Unit Page has buttons that will initiate action with xblock.
After the investigation it was determined that the condition is_course is sufficient to enable/disable actions on each xblock. Currently any action from the FE does not contain a condition for reflection so in the next FE PR it will be covered.

Testing instructions

1. Run master devstack.
2. Start platform make dev.up.lms+cms and make checkout on this branch.
3. Go to studio home page and choose the course.
4. Create Unit from the subsection and open it.
5. Copy location of the unit block.
6. Go to http://localhost:18010/api-docs.
7. Find the required API endpoint /api/contentstore/v1/container/vertical/{usage_key_string}/children.
8. Get usage_key_string from previous step and paste it to required API endpoint to get actions data for unit.

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.