feat(secret): remove python LP Validator/Verifier secret keys from repository

[izuru0]

Is your feature request related to a problem? Please describe.

keys for authentication for python LPs are stored in these directories, but it is discouraged to have such files included in the repository:

https://github.com/hyperledger/cactus/tree/main/packages-python/cactus_validator_socketio_indy/sample-CA
https://github.com/hyperledger/cactus/tree/main/packages-python/cactus_validator_socketio_iroha/sample-CA

Describe the solution you'd like

Generate these files during build process and remove them from repository