[tests] simplify and consolidate queries

[mchangrh]

add query strings for db into a single file, and add helper to generate boilerplate and standardized segments for simplifying test structures

todo:

• private/public userID helper
  • implement
  • usernames
• insert VIP user helper
• insert segments sponsorTimes helper
  • videoID generator
  • UUID generator
  • auto-generate with quantity
• insert lockCategory helper

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individual function checklist kept in private spreadsheet

[mchangrh]

.take