Info on sucessful adaptive step sizing is also shown for fixed-step-size integrators

[mknaranja]

Motivation / Current Behaviour

If using an EulerIntegratorCore and LogLevel::info, adaptive step sizing is reported to be successful although there was no adaptivity.

Enhancement description

The message should be replaced or better removed for fixed-step-size integrators.

Additional context

No response

Checklist

• Attached labels, especially loc:: or model:: labels.
• Linked to project