Drop deprecated IR config options

[End-rey]

Is your feature request related to a problem? Please describe.

I'm always frustrated when we have deprecated config options. It's time to drop them.

Describe the solution you'd like

Drop this IR config options:

• fschain_autodeploy
• without_mainnet
• governance.disable
• fee.main_chain
• contracts

Describe alternatives you've considered

It's time to get rid of unnecessary configuration options.

Additional context

#3619