Remove deprecated `--eth1.*` flags

[nflaig]

Remove deprecated --eth1.* flag in next major release

lodestar/packages/cli/src/options/beaconNodeOptions/eth1.ts

Line 6 in 2c19bd0

export type Eth1Args = {

lodestar/packages/cli/src/options/beaconNodeOptions/eth1.ts

Line 24 in 2c19bd0

export const options: CliCommandOptions<Eth1Args> = {

Also related to that, we can remove data cleanup code, we can do this after the next hard fork to make sure all users had their databases cleaned up

lodestar/packages/beacon-node/src/node/nodejs.ts

Lines 200 to 201 in 2c19bd0

	// Delete deprecated eth1 data to free up disk space for users
	await db.deleteDeprecatedEth1Data();