[receiver/purefa] Ensuring test efficiency for the endpoints scraped on Mock server

[dgoscn]

Description:
It is crucial to validate that the httpserver library effectively scrapes all the necessary data from the endpoints during the Mock test. This validation ensures the accuracy and completeness of the purefareceiver.

Link to tracking Issue:
#14886

Testing:
The validation test must be made by the default configs on config.yaml that is present on README.md and using Debugging session from the VSCode.

Documentation:
Present on README

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[linux-foundation-easycla]

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