Avoid inclusion of epikeys in roll_iqr

[brookslogan]

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[brookslogan]

Using detect_outlr_rm spams messages like

Adding missing grouping variables: `geo_value`

as it's using epi_slide which now autogroups, followed by dplyr::select([stuff that doesn't explicitly include epikey cols]).

Might be addressed by #564, which ungroups after slides if we autogrouped.

This also causes name conflicts if we try to unpack the outlier info because we now have duplicate epikey columns packed in the outlier info. (Workaround is to |> unnest() and ignore the advice to provide cols because providing cols also causes it to complain about naming conflicts.)