…1361)

## Summary
Shortened and streamlined geth and executor `run_until_stopped()`
functions to get rid of clippy exceptions and ensure events are emitted
within spans.

## Background
#1326 removed instrumentation on these `run_until_stopped()` functions,
which revealed a clippy warning for too many lines. Additionally, this
made it so that logging inside these functions would not be emitted
within any span.

## Changes
- Delegated many tasks to helper functions with instrumentation.
- Created new `utils` module to house a shared `report_exit_reason()`
function.
- Moved `ensure_chain_id_is_correct()` and `get_latest_nonce()` to
`init()` (previosuly `pre_run_checks()`)

## Testing
Passing all tests.


## Related Issues
Part of #1321

---------

Co-authored-by: Fraser Hutchison <190532+Fraser999@users.noreply.github.com>
Co-authored-by: Richard Janis Goldschmidt <github@aberrat.io>