stop uploading packages to downloads.rapids.ai

[jameslamb]

Description

Contributes to rapidsai/build-planning#181

• removes all uploads of conda packages and wheels to downloads.rapids.ai

Notes for Reviewers

How I identified changes

Looked for uses of the relevant gha-tools tools, as well as documentation about downloads.rapids.ai, being on the NVIDIA VPN, using S3, etc. like this:

git grep -i -E 's3|upload|downloads\.rapids|vpn'

How I tested this

See "How I tested this" on rapidsai/shared-workflows#364

Checklist

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

[jameslamb]

/ok to test

[jameslamb]

/ok to test

[jameslamb]

pandas tests are failing like this:

=========================== short test summary info ============================
FAILED python/cudf/cudf_pandas_tests/test_cudf_pandas.py::test_dataframe_query - pandas.errors.UndefinedVariableError: local variable 'bizz' is not defined
FAILED python/cudf/cudf_pandas_tests/test_cudf_pandas.py::test_cudf_pandas_eval_series[>] - pandas.errors.UndefinedVariableError: name 'lhs' is not defined
FAILED python/cudf/cudf_pandas_tests/test_cudf_pandas.py::test_cudf_pandas_eval_series[<] - pandas.errors.UndefinedVariableError: name 'lhs' is not defined
...
====== 21 failed, 396 passed, 1 skipped, 8 xfailed, 9 warnings in 35.82s =======

(build link)

My read of some offline conversations is that #18979 should fix this... but that's targeting branch-25.06, so it'll need to get forward-merged here.

[jameslamb]

/merge