Add subcortical figures for infant data to executive summary

[tsalo]

Closes none, but addresses remaining issues from #800.

Changes proposed in this pull request

• Add subcortical on T1w and T1w on subcortical figures. I'm not planning to add T2w given the refactoring happening in Load T1w-to-standard transform to same space as volumetric BOLD scan #926.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.28%. Comparing base (895da8f) to head (74bdd87).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #945      +/-   ##
==========================================
+ Coverage   83.26%   83.28%   +0.01%     
==========================================
  Files          53       53              
  Lines        6670     6676       +6     
  Branches      925      926       +1     
==========================================
+ Hits         5554     5560       +6     
  Misses        907      907              
  Partials      209      209              

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[tsalo]

Nibabies still needs to output the files that will be plotted, so I'm going to keep this as a draft until that's ready.

[tsalo]

@madisoth do you know if there's an issue or PR tracking the Nibabies output files XCP-D will need for these figures?