[TASK] Rename CI test client for Identity

[aabouzaid]

Related to

Epic: https://github.com/camunda/distribution/issues/312

Overview

We need to rename the CI test client for Identity to make it easier to be used by different teams.

Actions

### Sub-tasks
- [x] Rename the CI test client for Identity from `venom` to `test`.
- [ ] Remove any extra client provided by other teams in the [Distro GHA workflow](https://github.com/camunda/camunda-platform-helm/blob/main/docs/gha-workflows.md).
- [x] QA E2E repo is adjusted
- [x] Camunda/camunda repo is adjusted

[hisImminence]

Also mentioned here: #2528

[hisImminence]

Waiting for alpha release to be finished

[hisImminence]

After this is merged please check with QA is the 8.8 build can be resolved #3075