Adding code coverage processes on CI.yml workflow

[mgama-deepgram]

Proposed changes

• Adding code coverage processes on the CI.yml workflow on the test job
• The test job in the CI.yml workflow will now post the calculated code coverage as a PR comment

Types of changes

What types of changes does your code introduce to the community .NET SDK?
Put an x in the boxes that apply

• Bugfix (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 not work as expected)
• Documentation update or tests (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have lint'ed all of my code using repo standards
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[github-actions]

Package	Line Rate	Branch Rate	Health
Deepgram	22%	16%	❌
Summary	22% (1731 / 7841)	16% (233 / 1414)	❌