Improve query that checks storage space before channel deploy

[bjester]

Summary

Reduced the complexity of the query slightly by using an EXISTS clause instead of IN. In explaining the query, the runtime was cut in half and it appears the query plan is slightly better by avoiding hash buckets. It also seems that a runtime decision is made to further improve the query over its chosen plan, as it (never executed) a portion of the query, which gives further confidence the query planner has enough flexibility to chose a quicker execution plan.

Additionally, some semi-related storage calculation methods were marked as deprecated, as well as the endpoint where they're used, their only usage and a no longer used API by ricecooker.

References

closes #5069

Reviewer guidance

• See passing action check on first commit, where tests were added
• Tests pass after change

[AlexVelezLl]

Code changes makes sense. The new staging files query seems to be equivalent to the previous one, and the new resulting query appears to be more flexible now. lgtm!