Fail CI if coverage threshold checks fail

fix (generate-artifacts): Unicode fix for the output files  = '\' replaced with '/' because \u is considered a symbol & build throws an error

Docs generation for the Contracts + GH action for detecting missing Natspec comments.  

Increase branch coverage 

ci: Fix merge bug in CircleCI YAML

I encountered merge conflicts in the CircleCI YAML, and missed a stanza that builds proxyd.

ci: Add Slack notifications to nightly deployment

fix: message relayer docker build

maintenance: remove eslint-plugin-ban dependency

packages/contracts: Remove legacy `bin/deploy.ts` script

Removes the `bin/deploy.ts` script, which was a holdover from before the regenesis and was little more than a wrapper around `npx hardhat deploy`. The functionality that used to live in `bin/deploy.ts` has been moved into `ops/scripts/deployer.sh`, since the old script's functionality was exclusively run in CI.

Metadata:

- Fixes ENG-1447

ci: Add proxyd to nightly build

Metadata:

- Fixes ENG-1677

dtl: smaller range for filter query

On fresh startup, the DTL attempts to make a range
query that is very large when the starting L1 block
height is not configured. It looks for ownership
transferred events on the address manager, the first
one to happen indicates that the address manager was
deployed at that height.

Now that we use the same address manager over time instead
of the old way of upgrading the system where we would
redeploy the address manager each time, we must pass
the L1 start height as a config option to the DTL,
otherwise it will attempt to sync old transactions
(from a previous regenesis).

This commit will reduce the range at which the DTL
will query for the events, as alchemy only supports
a range of 2000. This will make the search prohibitively
slow, but that is ok as the value ought to be configured
anyways.

This functionality is really only useful for ephemeral networks.

A new logline is added for convenience.

fix: replace OE with Optimism