[Data] Jail unstructured_data_ingestion release test (#63236)

## Description
Move the `unstructured_data_ingestion` release test from `weekly` to
`manual` while the poor throughput / CPU utilization issue is
investigated.

The previous timeout bump could mask the underlying runtime behavior, so
this change removes the test from scheduled release runs instead of
extending its runtime budget.


Jailing test because the current CPU utilization is too low and the test
needs to be rewritten.

## Test plan
- Verified `release/release_tests.yaml` parses and
`unstructured_data_ingestion` resolves to `frequency: manual`.
- Commit hooks passed for the staged change.

---------

Signed-off-by: Goutam <goutam@anyscale.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: goutamvenkat-anyscale

release/release_tests.yaml

@@ -5157,7 +5157,7 @@
         cluster_compute: ci/gce.yaml  # relative to working_dir
 
 - name: unstructured_data_ingestion  # do not use dashes (regex sensitive)
-  frequency: weekly
+  frequency: manual # was weekly
   python: "3.11"
   group: ray-examples
   team: data