Enable branch testing for cudf.pandas (#15316)

This PR enables branch testing for `cudf.pandas` pandas pytest suite. This is 1st half of the actual changes I'd like to make. Once we merge this PR have a json file generated in s3 for `branch-24.04`, In a follow-up PR I will enable diff comparison and reporting.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Jake Awe (https://github.com/AyodeAwe)

URL: #15316

.github/workflows/test.yaml

@@ -125,5 +125,4 @@ jobs:
       branch: ${{ inputs.branch }}
       date: ${{ inputs.date }}
       sha: ${{ inputs.sha }}
-      # pr mode uses the HEAD of the branch, which is also correct for nightlies
-      script: ci/cudf_pandas_scripts/pandas-tests/run.sh pr
+      script: ci/cudf_pandas_scripts/pandas-tests/run.sh main

ci/cudf_pandas_scripts/pandas-tests/run.sh

@@ -45,3 +45,4 @@ python python/cudf/cudf/pandas/scripts/summarize-test-results.py --output json p
 RAPIDS_ARTIFACTS_DIR=${RAPIDS_ARTIFACTS_DIR:-"${PWD}/artifacts"}
 mkdir -p "${RAPIDS_ARTIFACTS_DIR}"
 mv pandas-testing/${PANDAS_TESTS_BRANCH}-results.json ${RAPIDS_ARTIFACTS_DIR}/
+rapids-upload-to-s3 ${RAPIDS_ARTIFACTS_DIR}/${PANDAS_TESTS_BRANCH}-results.json "${RAPIDS_ARTIFACTS_DIR}"