Create page tests for HIX signals

[MariaKabanova]

Short description

This PR for testing HIX score representation on page create

Proposed changes

Tests for:

• HIX score is requested and saved when the page translation is created and published
• HIX score is not requested when when the page translation without content is created and published

Related issues

Relates to: https://github.com/digitalfabrik/integreat-cms/issues/2582

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