FIX: Reduce auto recommending MCRIBS after 3 (chronological) months

[mgxd]

After comparisons across surface methods (mcribs/infantfs/fs_reconall) on BCP subjects (image below), and revisiting the MCRIBS paper, this PR caps using mcribs as the "recommended" surface reconstruction method to the first 3 months (chronological).

This only changes a recommendation - users are still available to run any of the surface reconstruction methods for participants of any age (--surface-recon-method <method>).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 56.45%. Comparing base (fef5aa8) to head (4e0cf4b).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
nibabies/workflows/base.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #438   +/-   ##
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  Coverage   56.45%   56.45%           
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  Files          70       70           
  Lines        6719     6719           
  Branches      828      828           
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  Hits         3793     3793           
  Misses       2717     2717           
  Partials      209      209           

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