fix(test): force v_pgfirstaid replace + bump 5m threshold to 24h

- Drop v_pgfirstaid before installing the patched managed view so the
  workflow's earlier unpatched install doesn't shadow our threshold edits.
- Move the 5-minute interval patch to 24 hours: the 1-hour patch still
  leaves the view firing the Long Running / Idle In Transaction checks
  once the test runs past an hour, which the CI matrix has begun to do.
  Bumping to 24 hours keeps the synthetic workload's deliberately-long
  sessions from ever tripping the check while still exercising the SQL
  path.

Author: pgFirstAid-CI