Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Purpose of change

Use the regional terrain for the mapgen s_petstore and modify the size of the parking lot in front of the store to suit the size of the cars in the game.

Describe the solution

Replace non-regional outdoor terrain with pseudo-regional terrain.

Describe alternatives you've considered

none

Additional context

Before:

After: