📖 Remove unit tests badge from README (#5067)

Remove unit tests badge from README

Removed the unit tests badge from the README.

Author: camilamacedo86

README.md

@@ -9,7 +9,6 @@
 > For more information and guidance see the discussion https://github.com/kubernetes-sigs/kubebuilder/discussions/3907
 
 [![Lint](https://github.com/kubernetes-sigs/kubebuilder/actions/workflows/lint.yml/badge.svg)](https://github.com/kubernetes-sigs/kubebuilder/actions/workflows/lint.yml)
-[![Unit tests](https://github.com/kubernetes-sigs/kubebuilder/actions/workflows/unit-tests.yml/badge.svg)](https://github.com/kubernetes-sigs/kubebuilder/actions/workflows/unit-tests.yml)
 [![Go Report Card](https://goreportcard.com/badge/sigs.k8s.io/kubebuilder)](https://goreportcard.com/report/sigs.k8s.io/kubebuilder)
 [![Coverage Status](https://coveralls.io/repos/github/kubernetes-sigs/kubebuilder/badge.svg?branch=master)](https://coveralls.io/github/kubernetes-sigs/kubebuilder?branch=master)
 [![Latest release](https://badgen.net/github/release/kubernetes-sigs/kubebuilder)](https://github.com/kubernetes-sigs/kubebuilder/releases)