Remove warning log from frame-omni-bencher CLI (#7020)

# Description

This PR removes the outdated warning message from the
`frame-omni-bencher` CLI that states the tool is "not yet battle
tested". Fixes #7019

## Integration

No integration steps are required.

## Review Notes

The functionality of the tool remains unchanged. Removes the warning
message from the CLI output.

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Co-authored-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: command-bot <>