SAMZA-2647: Clean up unused split deployment code

[cameronlee314]

Issues: Some code was added for SEP-24 some time ago (#1172, #1173), but we are not moving forward with SEP-24 because it does not cleanly handle certain use cases. Since we don't need this code, it should get removed.

Changes:

1. Removed unused flows related to job coordinator dependency isolation.
2. Removed unused classloader separation utils.

Tests:
./bin/integration-tests.sh /tmp/samza-tests yarn-integration-tests --nopassword passed

API changes and usage/upgrade instructions:
Removed some configs and environment variables related to split deployment, but the feature wasn't complete, so those shouldn't be used by Samza jobs anyways.

[Sanil15]

Looks good overall, I see in the testing section that you ran the yarn-integration tests, please ensure that still functional and up to date, I have personally never used it. I just deploy a samza-hello-samza app with a snapshot version.

IIRC was the code not config controlled ? If yes please cleanup any relevant markdowns / docs

[cameronlee314]

Looks good overall, I see in the testing section that you ran the yarn-integration tests, please ensure that still functional and up to date, I have personally never used it. I just deploy a samza-hello-samza app with a snapshot version.

IIRC was the code not config controlled ? If yes please cleanup any relevant markdowns / docs

I think I did need to update a version locally for the integration tests, but they should otherwise be up to date. I would suggest trying them out, since then you don't need to manually verify anything as long as they report "success".
The code was config controlled by job.split.deployment.enabled, but since the impl wasn't completed, I don't think any docs had been modified to add that yet. I couldn't find any references to the config in the repo.