Remove unused test utils (#51339)

Cleaning up dead code that I noticed while working on `_common/` dir
refactoring.

---------

Signed-off-by: Edward Oakes <ed.nmi.oakes@gmail.com>

Author: edoakes

python/ray/_private/test_utils.py

@@ -13,7 +13,7 @@
 
 import ray
 from ray._private.gcs_utils import GcsAioClient
-from ray._private.test_utils import async_wait_for_condition_async_predicate
+from ray._private.test_utils import async_wait_for_condition
 from ray.dashboard.modules.job.job_manager import JobManager
 from ray.job_submission import JobStatus
 from ray.tests.conftest import call_ray_start  # noqa: F401
@@ -172,7 +172,7 @@ async def test_submission_job_export_events(call_ray_start, tmp_path):  # noqa:
     )
 
     # Wait for the job to be finished.
-    await async_wait_for_condition_async_predicate(
+    await async_wait_for_condition(
         check_job_succeeded, job_manager=job_manager, job_id=submission_id
     )
 

python/ray/dashboard/modules/event/tests/test_generate_export_events.py

@@ -17,7 +17,7 @@
 from ray._private.runtime_env.py_modules import upload_py_modules_if_needed
 from ray._private.runtime_env.working_dir import upload_working_dir_if_needed
 from ray._private.test_utils import (
-    async_wait_for_condition_async_predicate,
+    async_wait_for_condition,
     chdir,
     format_web_url,
     get_current_unused_port,
@@ -643,7 +643,7 @@ async def verify():
 
             return True
 
-        await async_wait_for_condition_async_predicate(verify, retry_interval_ms=2000)
+        await async_wait_for_condition(verify, retry_interval_ms=2000)
     finally:
         subprocess.check_output("ray stop --force", shell=True)