Do the development board need certifications for market release

It depends on where you live. In my country, it’s not a big deal. Anyone can make hobby electronics circuits, development boards etc. and sell them. But if you want to export your boards, you’ll definitely need some certifications.

Depends on what kind of certification you are asking for. Is it component level or product level? Development boards are targeted for engineers to try firmware and some hardware testing before developing actual application board. Development boards generally do not cover certification aspects. If you are working on development board and want to have that edge in the market prefer to have certification related specifications at the cost of higher board price though.