Rename kitchenbench tasks to make it clear they belong to kitchenbench. (#1136)

## Summary
Rename the kitchenbench tasks to make their result folders identifiable.

## Detailed description
- All kitchenbench tasks now start with `kitchen_bench_replicator_*` or
`kitchen_bench_lightwheel_*`
- This makes the environment immediately identifiable in a folder with
mixed tasks from different benchmarks.
- Also corrects some inconsistency in the placement or `replicator` and
`lightwheel`

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Signed-off-by: alex <amillane@nvidia.com>

Author: alexmillane