Add new retention policy to power bi push datasets
Currently, Power BI datasets only support two retention policies:
-FIFO which allows 200 k rows and automatically removes old rows to accommodate for new ones when the limit is reached
-None which allows upto 5 million records but does not automatically remove old rows
A third option should be available which allows 5 million records and purges older records according to the retention policy. Either that or the FIFO policy should be updated to allow for a larger row limit instead of 200k.