Adds missing configuration for coverage pipeline

[Vasu1105]

Description

This PR is to add the missing configuration for coverage pipeline one .expeditor/config.yml Adds simplecov gem in the Gemfile for group test

Related Issue

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New content (non-breaking change)
• [ ] Breaking change (a content change which would break existing functionality or processes)

Checklist:

• [ ] I have read the CONTRIBUTING document.