[Test] Fix IndexAliasesTests#testRemoveIndex (#122864)

Exclude `.security*` aliases when calling Get Aliases API with the admin
superuser.

Resolves #122221

Author: slobodanadamovic

muted-tests.yml

@@ -288,9 +288,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.CrossClusterAsyncQueryStopIT
   method: testStopQueryLocal
   issue: https://github.com/elastic/elasticsearch/issues/121672
-- class: org.elasticsearch.xpack.security.authz.IndexAliasesTests
-  method: testRemoveIndex
-  issue: https://github.com/elastic/elasticsearch/issues/122221
 - class: org.elasticsearch.blocks.SimpleBlocksIT
   method: testConcurrentAddBlock
   issue: https://github.com/elastic/elasticsearch/issues/122324

x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/xpack/security/authz/IndexAliasesTests.java

@@ -881,7 +881,7 @@ public void testRemoveIndex() {
         GetAliasesResponse getAliasesResponse = client.admin().indices().prepareGetAliases(TEST_REQUEST_TIMEOUT).setAliases("*").get();
         assertThat(getAliasesResponse.getAliases().size(), equalTo(0));
         assertAliases(
-            indicesAdmin().prepareGetAliases(TEST_REQUEST_TIMEOUT).setAliases("*"),
+            indicesAdmin().prepareGetAliases(TEST_REQUEST_TIMEOUT).setAliases("*", "-.security*"),
             "bogus_index_1",
             "bogus_alias_1",
             "bogus_alias_2"