Add league/container, event-manager to composer and mozart

[Khadreal]

Description

Add league/container, event-manager to composer using mozart.

Fixes #776

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Is the solution different from the one proposed during the grooming?

No

Checklists

Generic development checklist

• [x] My code follows the style guidelines of this project, with adapted comments and without new warnings.
• [ ] I have added unit and integration tests that prove my fix is effective or that my feature works.
• [x] The CI passes locally with my changes (including unit tests, integration tests, linter).
• [ ] Any dependent changes have been merged and published in downstream modules.
• [ ] If applicable, I have made corresponding changes to the documentation. Provide a link to the documentation.

Test summary

• [ ] I triggered all changed lines of code at least once without new errors/warnings/notices.
• [ ] I validated all Acceptance Criteria of the related issues. (If applicable, provide proof).
• [ ] I validated all test plan the QA Review asked me to.

[Khadreal]

The event manager import into the dependencies is missing currently

Fixed