MBS-10901: Allow the chatbot to work in agent mode with unavailable chat purpose

[PhMemmel]

Closes #66

[lucaboesch]

This branch has conflicts that must be resolved.
Do you like me taking over, @PhMemmel ?

[PhMemmel]

@lucaboesch Branch should be clean again. Thanks for spotting!

[PhMemmel]

Thanks for your review:

• I amended the small context typo in state_header in the latest commit
• I provided the other changes in a fixup commit which I can rebase into the first commit if everything's fine.

[lucaboesch]

If I'm not mistaken the mariadb lines should be

        image: mariadb:11.8
        env:
          MARIADB_ALLOW_EMPTY_ROOT_PASSWORD: "1"
          MARIADB_CHARACTER_SET_SERVER: utf8mb4
          MARIADB_COLLATION_SERVER: utf8mb4_unicode_ci
        ports:
          - 3306:3306
        options: --health-cmd="mariadb-admin ping" --health-interval 10s --health-timeout 5s --health-retries 3

because mysqladmin on that mariadb image is retired.

[PhMemmel]

If I'm not mistaken the mariadb lines should be

        image: mariadb:11.8
        env:
          MARIADB_ALLOW_EMPTY_ROOT_PASSWORD: "1"
          MARIADB_CHARACTER_SET_SERVER: utf8mb4
          MARIADB_COLLATION_SERVER: utf8mb4_unicode_ci
        ports:
          - 3306:3306
        options: --health-cmd="mariadb-admin ping" --health-interval 10s --health-timeout 5s --health-retries 3

because mysqladmin on that mariadb image is retired.

Thanks @lucaboesch , yes, we'll have to implement this gradually across all our pipelines unfortunately. I updated ci.yml according to the latest dist file from moodle-plugin-ci

[PhMemmel]

@Snl-FGH I updated GHA as well and also pushed a fix commit for the mustache lint errors. I hope the patch is fine now.