Unmute XPackRestIT test {p0=snapshot/10_basic/Create a source only snapshot and then restore it} (#121733)

The XPackRestIT test {p0=snapshot/10_basic/Create a source only snapshot
and then restore it} had been failing due to spurious creation of ML
indices. That no longer seems to be the case as, after extensive local
testing, the test is passing.

Raising this PR to unmute the test

Relates #117295

Author: edsavage

muted-tests.yml

@@ -104,9 +104,6 @@ tests:
 - class: org.elasticsearch.discovery.ClusterDisruptionIT
   method: testAckedIndexing
   issue: https://github.com/elastic/elasticsearch/issues/117024
-- class: org.elasticsearch.xpack.test.rest.XPackRestIT
-  method: test {p0=snapshot/10_basic/Create a source only snapshot and then restore it}
-  issue: https://github.com/elastic/elasticsearch/issues/117295
 - class: org.elasticsearch.xpack.inference.InferenceRestIT
   method: test {p0=inference/40_semantic_text_query/Query a field that uses the default ELSER 2 endpoint}
   issue: https://github.com/elastic/elasticsearch/issues/117027