Draft: Rename block config files: Config.py -> Block.py

We discussed this problem a bit on !70384 (merged): the config block naming convention conflicts with component accumulator naming conventions. I took a first stab at cleaning this up.

Few notes:

• I was mainly focusing on the files, not the configuration functions therein, since those functions are a bit less consistent in the naming anyway.
• This was mostly git grep and sed based. I'm going to do a first run of the CI to see what breaks and then try to drill down a bit more.