DM-16179: Change log level to WARN for the footprint skipping

[laurenam]

Skipping of footprints in the deblender is a useful and important piece
of processing information, so should be set to WARN (instead of TRACE)
so that it will be logged with default logging settings.

[PaulPrice]

This looks good.
Just outta curiousity, why is the code duplicated?

[laurenam]

I believe that is a question for @fred3m (and his Multiband tasks) :)

[fred3m]

Two different classes, SourceDeblendTask and MultibandDeblendTask. There are a few small code blocks that are nearly identical but not enough to warrant having a base class, especially since we expected to change MultibandDeblendTask. As it turns out we changed it so much that we just made a new package meas_extensions_scarlet.