simplify interaction with multisig wallets in deployment scripts

[alysiahuggins]

Simplify the deployment & upgrade scripts to use the multisig wallet only in these situations:

• executing the upgradeToAndCall method on the proxy to upgrade to a new implementation contract -calling methods that are restricted to onlyAdmin e.g. setPermissionedProver, disablePermissionedProverMode etc This assumes the multisig was set as the owner of the proxy as soon as it has been deployed.

Add the following checks

• the admin of the proxy is usable and indeed a multisig wallet