test: add a test for investigating nsfw in a stream

[MBSM110]

Pull Request Checklist

Please check if your pull request fulfils the following requirements:

• [x] The commit message follows our guidelines: https://gitlab.playpod.ir/alpha/backend/nakama-module-next/-/blob/main/CONTRIBUTING.md#commit-message-format
• [x] Tests for the changes have been added / updated (for feat / fix / refactor)
• [x] Docs for the changes have been added / updated (for feat / fix / refactor)

Pull Request Type

What kind of change does this pull request introduce?

• [ ] Build: Changes that affect the build system or external dependencies
• [ ] CD: Changes to our CD configuration files and scripts
• [ ] CI: Changes to our CI configuration files and scripts
• [ ] Docs: Documentation only changes
• [ ] Feat: A new feature
• [ ] Fix: A bug fix
• [ ] Perf: A code change that improves performance
• [ ] Refactor: A code change that neither fixes a bug nor adds a feature
• [x] Test: Adding missing tests or correcting existing tests

What is the current behaviour?

Issue #460

What is the new behaviour?

Does this Pull Request introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Closes #460