Replace deprecated codecov uploader

[sozercan]

Describe the solution you'd like
[A clear and concise description of what you want to happen.]
Codecov bash uploader is deprecated, we should replace that with https://github.com/codecov/codecov-action

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]
https://docs.codecov.com/docs/about-the-codecov-bash-uploader

Environment:

• Secrets Store CSI Driver version: (use the image tag):
• Azure Key Vault provider version: (use the image tag):
• Kubernetes version: (use kubectl version):
• Cluster type: (e.g. AKS, aks-engine, etc):