refactor: o3de config

[jmatejcz]

Purpose

#628

Proposed Changes

Adding o3de config to repo as now game launcher is inside a common path in demo assets.
Previously the config wasnt added as we needed to write our own path inside it.

removed it from tests, and docs
in argparse it has default value now

Issues

#628

Testing

python src/rai_bench/rai_bench/examples/manipulation_o3de.py --model-name qwen2.5:7b  --vendor ollama  --levels trivial easy