revert adding badge

Author: tony-josi-aws

README.md

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 [![CMock Unit Tests](https://github.com/FreeRTOS/FreeRTOS-Kernel/actions/workflows/unit-tests.yml/badge.svg?branch=main&event=push)](https://github.com/FreeRTOS/FreeRTOS-Kernel/actions/workflows/unit-tests.yml?query=branch%3Amain+event%3Apush+workflow%3A%22CMock+Unit+Tests%22++)
 [![codecov](https://codecov.io/gh/FreeRTOS/FreeRTOS-Kernel/badge.svg?branch=main)](https://codecov.io/gh/FreeRTOS/FreeRTOS-Kernel)
-[![Coverity Scan Status](https://scan.coverity.com/projects/freertos-kernel/badge.svg)](https://scan.coverity.com/projects/freertos-kernel)
 
 ## Getting started