Look into merging dev and integration-tests networks

[HCastano]

Right now we have some TSS tests which run with --chain integration-tests. It seems to me like we should try and remove the integration-tests configuration and roll those changes into the dev configuration.

This would simplify the amount of chains we need to track, and keep our "development" and "testing" environments equivalent.

While working through this I would try and keep the new, merged, chain spec as simple as possible. Ideally we don't just copy and paste the integration-tests config into the dev module and call it a day. Instead we should review what is being set and why.