Use nearest-neighbors interpolation in `plot_component`

[tsalo]

Closes #1095.

Changes proposed in this pull request:

• Switch from the default 'continuous' resampling approach to 'nearest' in plot_component's plot_stat_map call. This should stop non-diagonal images from being resampled to have low, non-zero values outside of the brain.

[tsalo]

From Logan's 8-echo dataset.

Before:

After:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.91%. Comparing base (12aea7f) to head (d8df3e6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1098 +/- ## ======================================= Coverage 89.91% 89.91% ======================================= Files 26 26 Lines 3621 3621 Branches 629 629 ======================================= Hits 3256 3256 Misses 214 214 Partials 151 151 ```

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[tsalo]

Good point. I dropped the change for plot_stat_map calls outside of plot_component.

[tsalo]

Yeah we'd need to use threshold instead of vmin, but I played around with that and had some issues, so I think this is fine for now. If we end up overlaying our stat maps on other images (e.g., mean OC, T1w) then we might need to revisit.

[tsalo]

I'd like to make a release with this change before we merging #1064. @handwerkerd any objections?