fix: fixed help center to integrate with frontend

[JoshuaOloton]

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Description

Resolved issues with the help center endpoints that were not processing correctly. Also fixed the Help Center GET filter endpoint by removing the request body and corrected the placement of the topic ID.
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Related Issue (Link to issue ticket)

#960
hngprojects/hng_boilerplate_nestjs#951
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Motivation and Context

These changes are necessary to ensure the help center endpoints function correctly. The changes address the incorrect processing of requests, eliminates the request bodies in the GET filter endpoint, and corrects the placement of the topic ID.

How Has This Been Tested?

Unit tests were written and carried out for this endpoint using the Pytest library.
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Screenshots (if appropriate - Postman, etc):

SWAGGER UI

UPDATE HELP CENTER TOPIC

FILTER HELP CENTER TOPICS

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.