Remove conda channel setup from wheel CI image script. (#15539)

The new `configure_cpp_static.sh` script added in #15437 is calling `rapids-configure-conda-channels`. However, it is doing so on a `ci-wheel` image, which fails. This is causing CI issues and needs to be removed.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Ray Douglass (https://github.com/raydouglass)

URL: #15539

ci/configure_cpp_static.sh

@@ -3,8 +3,6 @@
 
 set -euo pipefail
 
-rapids-configure-conda-channels
-
 source rapids-date-string
 
 rapids-logger "Configure static cpp build"