Use SynthStrip-derived brainmask instead of current aseg-derived brainmask

[LuciMoore]

A short summary of what you would like to see in BIBSnet.

would make application run faster and I think the SynthStrip-derived outputs are likely more robust across different ages and protocols (just based on some quick personal review). but would maybe be best to test this thoroughly first or at least add aseg-derived brainmask output as an optional flag until we're more sure about which method is optimal

Do you have any interest in helping implement the feature?

Yes!

Add any additional information or context about the request here.

No response