remove rust based cli executables

[YOU54F]

these following are now available in our combined cli, which is released to docker

https://github.com/YOU54F/pact-cli

• pact_verifier_cli from https://github.com/pact-foundation/pact-reference
• pact_mock_server_cli from https://github.com/pact-foundation/pact-core-mock-server
• pact-stub-server from https://github.com/pact-foundation/pact-stub-server
• pact-plugin-cli from https://github.com/pact-foundation/pact-plugins