I’ve searched as much as I could...
For the double-sided tinned universal pcb prototyping boards...
They have a bunch of oval solder spots on each end of the board (see pic).
What is the use case for those?
There are many uses for these oval pads:
Since, the PCB you have mentioned is used for prototyping circuits, its up to the user to decide how to use them and there can be many more scenarios in which they can be used.