Don't demand to set DATADOG_API_KEY if it's not used in favor of DATADOG_SOURCEMAP_INTAKE_URL

[OnkelTem]

Bug description

I run npx datadog-ci sourcemaps upload ...

And I have DATADOG_SOURCEMAP_INTAKE_URL set, which means DATADOG_API_KEY isn't gonna be used.
And if it's not used, it shouldn't be required as it produces confusion.

P.S. Both of these variables are not covered in the docs.
P.P.S. Also every variable a CLI utility uses should also be accepted via CLI interface, which is not the case with the abovementioned vars.

Describe what you expected

No response

Steps to reproduce the issue

No response

Additional context

alpine docker image with node and stuff

Command

None

[BenoitZugmeyer]

Hi @OnkelTem

Even with DATADOG_SOURCEMAP_INTAKE_URL, metrics are sent to datadog using the API key. So it's still used and required.

Do you have any concern with this?