test: deploy vault factory with hardcoded salt

[gosuto-inzasheru]

Description

adds tests that illustrate using a hardcoded salt to deploy the vault factory

Type of change

• Other: more tests

Checklist:

• The diff is legible and has no extraneous changes
• Complex code has been commented, including external interfaces
• Tests have 100% code coverage
• The base branch is either main, or there's a description of how to merge

[gosuto-inzasheru]

➜ bytes internal constant _PROXY_BYTECODE = hex"67_36_3d_3d_37_36_3d_34_f0_3d_52_60_08_60_18_f3";
➜ bytes32 internal constant _PROXY_BYTECODE_HASH = keccak256(_PROXY_BYTECODE);
➜ _PROXY_BYTECODE_HASH
Type: bytes32
└ Data: 0x21c35dbe1b344a2488cf3321d6ce542f8e9f305544ff09e4993a62319a497c1f