Provide RTS flag to not automatically start cost centre profiling

It can be useful to not automatically start cost centre profiling when using -p, in case you want to control this process manually using functions in GHC.Profiling. This is similar to the --no-automatic-heap-samples RTS flag which allows you to control heap profiling in a similar way.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information