hydra-build: only send email if the status differs from the previous build

Dependencies

• [2] FYO6NECE hydra
• [3] OG7BEM57
• [4] LGNML7VJ Don't use a prepared statement for the active build steps query
• [*] 7YBYT2LQ

Change contents

• replacement in src/script/hydra-build at line 90
  [2.4035]→[2.4035:4112](∅→∅)
  − , id => { '!=', $build->id }

  − }, { order_by => ["timestamp DESC"] }
  [2.4035]

  [2.4113]
  + , id => { '<', $build->id }

  + }, { order_by => ["id DESC"] }