[WIP] update test version

[lupin012]

This PR uses a new version of rpc-test (temporarily on a branch) (waiting TAG):
a) Closes #15758
b) Allows defining metadata in JSON format within rpc-tests to:

• Specify which tests run on latest (avoid fixed list on rpc-test tool)
• Define fields that should not be compared (e.g., error strings).

i.e:
[
{
"metadata": {
"latest": true,
"ignoreFields": ["result.structLogs[*].error"]
},
"test": {
"description": ""
},
"request": [{}],
"response": [{}]
}
]