Change how ExtrinsicBaseWeight is calculated #9981
Description
Right now the ExtrinsicBaseWeight is calculated by taking no-op transactions:
With the introduction of transaction extensions, each extension already exposes their own weight. So, right now we are including the transaction extension weight two times. Once in the ExtrinsicBaseWeight and once via the extensions itself.
To solve this we need to have a benchmark that only benchmarks the extrinsic part that isn't included by the transaction extensions. So, probably just benchmarking the extrinsic with an empty set of extensions should do the trick.
CC @ggwpez