Cleanup: CreateTestResult payload construction and minor typo in cmd

[PranjaliBhardwaj]

I found the code in pkg/connectors/microcks_client.go and see that the CreateTestResult function is creating the JSON body using string concatenation. A little brittle and difficult to add more fields to the test request later on.

Also, I noticed that in cmd/cmd.go, the main entry point is called NewCommad (and not NewCommand).

I'm happy to put together a PR to:

Utilise a correct struct and json.Marshal test request payload.
Correct the typo in the NewCommad package and main.go in the CLI.

[github-actions]

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