Remove ray.workflow package (#53612)

Completes the deprecation of workflows.

`import ray.workflows` will raise:
```
RuntimeError: The experimental Ray Workflows library was deprecated in Ray 2.44 and has been removed. The last Ray release containing ray.workflows is `ray==2.47`.
```

---------

Signed-off-by: Edward Oakes <[email protected]>

Author: edoakes

.buildkite/core.rayci.yml

@@ -158,24 +158,6 @@ steps:
         --test-env=TEST_EXTERNAL_REDIS=1
         --only-tags=tmpfs --tmp-filesystem=tmpfs
 
-  - label: ":ray: core: workflow tests"
-    tags:
-      - python
-      - workflow
-      - oss
-      - skip-on-premerge
-    instance_type: medium
-    parallelism: 2
-    commands:
-      - bazel run //ci/ray_ci:test_in_docker -- //python/ray/workflow/... core
-        --workers "$${BUILDKITE_PARALLEL_JOB_COUNT}" --worker-id "$${BUILDKITE_PARALLEL_JOB}"
-        --except-tags use_all_core
-        --parallelism-per-worker 2
-      - bazel run //ci/ray_ci:test_in_docker -- //python/ray/workflow/... core
-        --workers "$${BUILDKITE_PARALLEL_JOB_COUNT}" --worker-id "$${BUILDKITE_PARALLEL_JOB}"
-        --skip-ray-installation
-        --only-tags use_all_core
-
   - label: ":ray: core: doc tests"
     tags:
       - python

ci/lint/check_api_annotations.py

@@ -87,7 +87,6 @@ def verify(symbol, scanned, ok, output, prefix=None, ignore=None):
     import ray.serve
     import ray.train
     import ray.tune
-    import ray.workflow
 
     output = set()
     ok = set()
@@ -104,13 +103,12 @@ def verify(symbol, scanned, ok, output, prefix=None, ignore=None):
         set(),
         ok,
         output,
-        ignore=["ray.workflow", "ray.tune", "ray.serve"],
+        ignore=["ray.tune", "ray.serve"],
     )
     verify(ray.serve, set(), ok, output)
     assert len(ok) >= 500, len(ok)
     # TODO(ekl) enable it for all modules.
     #    verify(ray.tune, set(), ok, output)
-    #    verify(ray.workflow, set(), ok, output)
 
     print("Num ok", len(ok))
     print("Num bad", len(output))

doc/BUILD

@@ -447,8 +447,6 @@ doctest(
             "source/train/**/*.rst",
             "source/tune/**/*.md",
             "source/tune/**/*.rst",
-            "source/workflows/**/*.md",
-            "source/workflows/**/*.rst",
         ],
     ),
     tags = ["team:none"],
@@ -593,17 +591,6 @@ doctest(
     tags = ["team:ml"],
 )
 
-doctest(
-    name = "doctest[workflow]",
-    files = glob(
-        include = [
-            "source/workflows/**/*.md",
-            "source/workflows/**/*.rst",
-        ],
-    ),
-    tags = ["team:core"],
-)
-
 filegroup(
     name = "example_configs",
     srcs = glob(["source/ray-overview/examples/**/*.yaml"]),

doc/source/ray-more-libs/index.rst

@@ -12,7 +12,6 @@ More Ray ML Libraries
     mars-on-ray
     modin/index
     data_juicer_distributed_data_processing
-    Ray Workflows (Deprecated) <../workflows/index>
 
 
 .. TODO: we added the three Ray Core examples below, since they don't really belong there.