staking miner: reuse ws conn for remote-ext (#4849)

* staking miner: use config for emergency solution

Fixes #4678

* bump jsonrpsee

* run `monitor_cmd_for` until the connection is closed

* new tokio task for submit_and_watch xt

* re-use header subscription

* update jsonrpsee + simplify code

* revert polkadot runtime changes

* fix grumbles

* Update utils/staking-miner/src/monitor.rs

* staking miner: reuse ws conn for remote-ext

* Revert "revert polkadot runtime changes"

This reverts commit 5fddbbec40702c122b079526915cabac8facdbc1.

* cargo fmt

* revert unintentional change

* revert unintentional change

* add type SharedRpcClient

* cargo fmt

* fix nits

* spelling

* use tracing_subcriber and cleanup

* remove some needless clones

* fix some nits

* fix spellcheck