Add formatting target for easy fixes with golangci-lint

What does this MR do?

Adds a phony format target to format code with golangci-lint.

Why was this MR needed?

Helps automatically format the code according to the rule setup. In future, if new linters are added, it would make it easy to format code.

What's the best way to test this MR?

Run make format

What are the relevant issue numbers?

NA