Load deps in checkout like we do everywhere else

James Ennisrequested to merge
jennis/load_deps_consistently into master

Description

In our frontend, any command which supports the --deps option will carry the string ("all"|"none"|"run"|"build") into the Stream and then load the pipeline with the appropriate pipeline selection.

This patch ensures that when we bst artifact checkout, we load with the PipelineSelection which corresponds to the --deps option specified.

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