Change scanner to boldref in non-HMC transform filenames

[tsalo]

Closes #3117.

Changes proposed in this pull request

• Change scanner to boldref for the <source_entities>_from-scanner_to-T1w_mode-image_xfm.txt and <source_entities>_from-T1w_to-scanner_mode-image_xfm.txt transform files.
• Update the expected outputs for tests.

Documentation that should be reviewed

• outputs.rst
  • I added comments distinguishing the from-scanner and from-boldref transforms.

[effigies]

Please base all prs against next. There will not be another release from current master.

[tsalo]

Fixed. Thanks for the heads up!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (978ae51) 46.89% compared to head (3808127) 46.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3118   +/-   ##
=======================================
  Coverage   46.89%   46.89%           
=======================================
  Files          53       53           
  Lines        4224     4224           
=======================================
  Hits         1981     1981           
  Misses       2243     2243           

Files	Coverage Δ
fmriprep/workflows/bold/outputs.py	20.68% <ø> (ø)

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[effigies]

@tsalo sorry, I think I've wasted your time. Under next, these will already be renamed:

[tsalo]

Ah, no worries. I'll just close the PR then.