[update-checkout] Move all files except the top level entrypoints int… #16580
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…o ./utils/update_checkout/*.
This makes update_checkout into a true python module that we can add nosetests
for, readme, and also split up without issue into multiple small files.
I also added a small stub test directory and support for running tests for
update_checkout during validation-testing. So once we add some tests, everything
is setup correctly in terms of the swift build for testing purposes.