Fix flaky test_deploy test. (PR #9684)

# Description

Follow up to #9673

# Self Check:

Strike through any lines that are not applicable (`~~line~~`) then check the box

- [ ] Attached issue to pull request
- [ ] Changelog entry
- [ ] Type annotations are present
- [ ] Code is clear and sufficiently documented
- [ ] No (preventable) type errors (check using make mypy or make mypy-diff)
- [ ] Sufficient test cases (reproduces the bug/tests the requested feature)
- [ ] Correct, in line with design
- [ ] End user documentation is included or an issue is created for end-user documentation (add ref to issue here: )
- [ ] If this PR fixes a race condition in the test suite, also push the fix to the relevant stable branche(s) (see [test-fixes](https://internal.inmanta.com/development/core/tasks/build-master.html#test-fixes) for more info)

Author: Hugo-Inmanta

changelogs/unreleased/fix-flaky-test-test_deploy.yml

@@ -0,0 +1,3 @@
+description: Fix flaky test_deploy test.
+change-type: patch
+destination-branches: [master, iso8]

tests/deploy/e2e/test_deploy.py

@@ -1468,6 +1468,7 @@ async def assert_states(expected_states: dict[ResourceIdStr, ReleasedResourceSta
         wait_for_deploy=False,
     )
     await agent.scheduler.start()
+    await wait_until_deployment_finishes(client, env_id, version=version)
     await assert_states(
         {
             ResourceIdStr("test::Resource[agent1,key=key1]"): ReleasedResourceState.deployed,