scikit-hep / iminuit / 33642109919

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perf: construct strategy-2 MnMigrad only when retrying (#1156)

:robot: _AI text below_ :robot:

`_robust_low_level_fit` always built a strategy-2 `MnStrategy` and
`MnMigrad`
instance, even when the retry loop was never entered (which is the
common
case, e.g. once per scan point in `mnprofile`/`mncontour`). This fix
builds
them lazily, only when the retry condition actually holds. It also
removes an
unused `n = len(m)` assignment in `Minuit._make_covariance`.

Split from #1138, part of #1132.

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