Bids 2.0: work out testing against bids-examples

[yarikoptic]

To minimize "traffic" on bids-2.0 PR

[yarikoptic]

woohoo -- we are green on validate! I thought to add detection and do git mv instead of mv for a good measure... will do that although not sure if it would actually be needed in my next idea: push those into bids-2.0 on bids-examples...

[codecov]

Codecov Report

Attention: Patch coverage is 74.19355% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 87.50%. Comparing base (0879828) to head (ba27557).

Files	Patch %	Lines
tools/schemacode/bidsschematools/migrations.py	74.19%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           bids-2.0    #1798      +/-   ##
============================================
- Coverage     88.09%   87.50%   -0.60%     
============================================
  Files            17       17              
  Lines          1579     1432     -147     
============================================
- Hits           1391     1253     -138     
+ Misses          188      179       -9     

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