Product price missing in lab 6

[ronaldbosma]

At the end of step 1 in lab 6 you get build errors because the Price property is missing from Product. There's two ways to fix this:

1. Update lab 3 to include the Price in Product and ProductConfiguration.
   If you checkout the lab3 tag in ModMonWorkshop2025, the price is included. So this might be the best approach.
2. Add steps to lab 6 to add the Price in Product and ProductConfiguration, and execute an EF migration.
   You might also want to update ModMonWorkshop2025 so the price is not included when checking out the lab3 tag.