Allow uint8 in NCCL ALLtoALL

[srivatsankrishnan]

Summary

Allow the datatype field to be uint8 along with float

Test Plan

CI
Dry-run

(venv) $ cloudai dry-run --system-config ../cloudaix/conf/common/system/xxxx.toml --tests-dir conf/common/test --test-scenario conf/common/test_scenario/nccl_test.toml 
[INFO] System Name: xxxx
[INFO] Scheduler: slurm
[INFO] Test Scenario Name: nccl-test
[INFO] Checking if test templates are installed.
[INFO] Test Scenario: nccl-test

Section Name: Tests.1
  Test Name: nccl_test_all_gather
  Description: all_gather
  No dependencies
[INFO] Initializing Runner [DRY-RUN] mode
[INFO] Creating SlurmRunner
[INFO] Starting test scenario execution.
[INFO] Starting test: Tests.1
[INFO] Running test: Tests.1
[INFO] Submitted slurm job: 0
[INFO] Job completed: Tests.1
[INFO] All test scenario results stored at: results/nccl-test_xxxxxx

Additional Notes