Refactor cli `trusted_operation.rs`

Our current cli (https://github.com/integritee-network/worker/blob/e738bd6a2e38f36c6b235ba632bc705393f313ed/cli/src/trusted_operation.rs) contains some huge functions with much duplicate code. This should be cleaned up.

Keep in mind: https://github.com/integritee-network/worker/issues/1040 and https://github.com/integritee-network/worker/issues/1065