fix: unnecessary replay runs update

[arinda-arif]

Reduce update calls to DB for replay cases:

• Avoid updating every replay run in each loop
  • Avoid updating runs at the start of the loop. Instead, Optimus will only update the runs at the end of each loop.
  • Before doing an update, the replay worker will fetch the list of differed runs and will only update those. By this, the updated_at value of each run will be valid, based on when it is actually finished.
• Avoid checking whether the replay is canceled or not before executing. A similar check was done at the start of the loop. This is also safe to do as if the execution is proceeded (due to race conditions), the status will not be updated to in_progress.

[Mryashbhardwaj]

just need one small optimisation , rest all is perfect