Cherry-pick #125: fix AORTA benchmark config resolution and documentation for 0.2.0

[speriaswamy-amd]

Summary

• cherry-pick merged PR Fix AORTA benchmark config resolution and documentation #125 onto release/cvs-0.2.0
• resolve AORTA benchmark config placeholders before schema/path validation so the shipped sample flow works on the release branch
• sync AORTA sample config, docs, and focused unit coverage with the updated placeholder behavior and related path guidance

Test plan

• Not run in this cherry-pick branch
• Relies on the validation already completed for merged PR Fix AORTA benchmark config resolution and documentation #125

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