Update PAM50 template links and fix related test errors #4268
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Description
This PR updates the PAM50 template links to include new changes to the PAM50 template, including cauda equinea labels (needed for #4250) and updates to the PAM50 cord and levels files. (Full details here.)
These updates, however, caused some failures to existing tests. I previously investigated these in #4254 (comment), and added fixes in #4250 (comment). But, I think it's better to keep all of these related changes outside of the tutorial PR. So, I've cherry-picked the fixes here as well, and will revert the associated commits in #4254.
Linked issues
Fixes #4254.
Partially addresses #4215. (We still need to update the SCT course to account for the spinal levels.)