Fix flakiness on YAML tests for Sparse Vector (elastic#137202) (elastic#137251)

* add indices to deletion on teardown

* unmute test (only the 1 is muted)

(cherry picked from commit 2d45a8d)

# Conflicts:
#	muted-tests.yml

Author: markjhoy

muted-tests.yml

@@ -641,3 +641,4 @@ tests:
 #  - class: "org.elasticsearch.xpack.esql.**"
 #    method: "test {union_types.MultiIndexIpStringStatsInline *}"
 #    issue: "https://github.com/elastic/elasticsearch/..."
+

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/ml/sparse_vector_search.yml

@@ -99,7 +99,7 @@ teardown:
         Authorization: "Basic eF9wYWNrX3Jlc3RfdXNlcjp4LXBhY2stdGVzdC1wYXNzd29yZA==" # run as x_pack_rest_user, i.e. the test setup superuser
         Content-Type: application/json
       indices.delete:
-        index: ["sparse_vector_pruning_test", "test-sparse-vector-without-pruning", "test-sparse-vector-with-pruning"]
+        index: [ "index-with-sparse-vector", "sparse_vector_pruning_test", "test-sparse-vector-without-pruning", "test-sparse-vector-with-pruning", "test-sparse-vector-pruning-default" ]
         ignore: 404
   - do:
       headers: