chore: Update the port of the codec tests

[EmandM]

• Add a configurable port for the DA codec tests (env variable: ECHO_SERVER_PORT)
• Add an environment variable (ENSURE_CODEC_TESTS) that when set, will fail the codec tests if they fail to connect to an echo-server. The current/default behaviour is to ignore the tests when no echo-server is available
• Run the rust echo-server inside yamato so that we can run the codec tests in our yamato tests
• Ensure when running the codec tests that the ENSURE_CODEC_TESTS variable is set to ensure a test failure if the tests fail to connect to the echo-server

MTT-11549

Changelog

• Added: Automated testing of the DistributedAuthorityCodecTests that run against a rust echo server built off the latest commit on their main branch

[NoelStephensUnity]

Nice!