Add function formatting file field in the log output

[tznamena]

With this change, the file field in the log output will only show file name without path and the line number where the call originated.
Going from:

... func=github.com/microsoft/commercial-marketplace-offer-deploy/internal/hook.(*httpSender).Send.func1 file=/home/tznamena/Projects/Ansible/AoC/Code/azure-aap-deployment-driver/build/commercial-marketplace-offer-deploy/internal/hook/sender.go:50 ...

To:

... func=github.com/microsoft/commercial-marketplace-offer-deploy/internal/hook.(*httpSender).Send.func1 file=sender.go:50 ...

This would resolve issue #299

[tznamena]

@microsoft-github-policy-service agree