feat: add new signal to indicate new course import

[navinkarkera]

Description

Adds COURSE_IMPORT_COMPLETED signal that is triggered once a course import is completed.

Supporting information

• Related PR: feat: upstream-downstream entity linking [FC-0076] edx-platform#36111

Testing instructions

See openedx/edx-platform#36111

Deadline

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Other information

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Merge Checklist:

• All reviewers approved
• Reviewer tested the code following the testing instructions
• CI build is green
• Version bumped
• Changelog record added with short description of the change and current date
• Documentation updated (not only docstrings)
• Code dependencies reviewed
• Fixup commits are squashed away
• Unit tests added/updated
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

Post Merge:

• Create a tag
• Create a release on GitHub
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)
• Upgrade the package in the Open edX platform requirements (if applicable)

[openedx-webhooks]

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[pomegranited]

👍

• I tested this as part of testing feat: upstream-downstream entity linking [FC-0076] edx-platform#36111
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation
• User-facing strings are extracted for translation N/A

[ChrisChV]

Looks good 👍

[mariajgrimaldi]

@navinkarkera: thanks for addressing the comments on the PR!

LGTM! Please merge and release the new lib version when you see fit :)