testsys: provide assume agent role to workload crd

[gthao313]

Issue number:

Closes #

Description of changes:
testsys: provide assume agent role to workload crd

Testing done:
Launch workload test for aws-k8s-1.27 and aws-k8s-1.27-nvidia

cargo make -e TWOLITER_ALLOW_SOURCE_INSTALL=true \
           -e TWOLITER_ALLOW_BINARY_INSTALL=false  \
           -e TWOLITER_REPO="https://github.com/gthao313/twoliter.git" \
           -e TWOLITER_VERSION="v0.0.2" \
           -e TESTSYS_KUBECONFIG=${TESTSYS_KUBECONFIG} \
           -e TESTSYS_TEST=workload \
           -e BUILDSYS_VARIANT=aws-k8s-1.27 \
           -e BUILDSYS_ARCH=x86_64 \
           -e TESTSYS_TEST_CONFIG_PATH=Test.toml \
           test

result

 NAME                                                          TYPE                   STATE                                    PASSED                   FAILED                   SKIPPED   BUILD ID                   LAST UPDATE
 cluster-ipv4-test                                             Test                   passed                                        1                        0                         0   d533ff69                   2024-03-15T07:39:10Z
 x86-64-aws-k8s-127-nvidia-cluster-ipv4-test                   Test                   passed                                        2                        0                         0   d533ff69                   2024-03-15T07:34:05Z

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