Create a simple script that can set the
config for the  `OVM_GasPriceOracle` using `cast`.
Using the `hardhat` task requires 4gb+
of memory when running.

Also remove the `set-l2-gasprice` hardhat
task that does the same functionality
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>