create conda ci test env in one step

[msarahan]

Description

This is a port of https://github.com/rapidsai/cuml/pull/5781 and part of https://github.com/rapidsai/build-planning/issues/22

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.

[jakirkham]

Thanks Michael! 🙏

[trxcllnt]

/merge

[jakirkham]

There were some CI failures, which it looks like Rob recently fixed in PR: https://github.com/rapidsai/rmm/pull/1569

Restarting the failed CI jobs

Should add the failed CI jobs are unrelated to the fix that this PR is proposing (they involved wheel builds)

[trxcllnt]

Also blocked by https://github.com/rapidsai/cudf/pull/15840

[harrism]

Those are both merged. What's holding this now?

[trxcllnt]

@harrism nothing, I just re-ran the failing jobs

[jakirkham]

Was waiting for packages from those before restarting. Looks like they were uploaded ~20mins ago. So hopefully now things clear up

[jakirkham]

Thanks all! 🙏