Unmute Categorize VerifierTests and require snapshot on them (#117016)

Fixes #116856
Fixes #116857
Fixes #116858

Author: ivancea

muted-tests.yml

@@ -208,15 +208,6 @@ tests:
   issue: https://github.com/elastic/elasticsearch/issues/116777
 - class: org.elasticsearch.xpack.searchablesnapshots.hdfs.SecureHdfsSearchableSnapshotsIT
   issue: https://github.com/elastic/elasticsearch/issues/116851
-- class: org.elasticsearch.xpack.esql.analysis.VerifierTests
-  method: testCategorizeWithinAggregations
-  issue: https://github.com/elastic/elasticsearch/issues/116856
-- class: org.elasticsearch.xpack.esql.analysis.VerifierTests
-  method: testCategorizeSingleGrouping
-  issue: https://github.com/elastic/elasticsearch/issues/116857
-- class: org.elasticsearch.xpack.esql.analysis.VerifierTests
-  method: testCategorizeNestedGrouping
-  issue: https://github.com/elastic/elasticsearch/issues/116858
 - class: org.elasticsearch.search.basic.SearchWithRandomIOExceptionsIT
   method: testRandomDirectoryIOExceptions
   issue: https://github.com/elastic/elasticsearch/issues/114824

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java

@@ -1732,6 +1732,8 @@ public void testIntervalAsString() {
     }
 
     public void testCategorizeSingleGrouping() {
+        assumeTrue("requires Categorize capability", EsqlCapabilities.Cap.CATEGORIZE.isEnabled());
+
         query("from test | STATS COUNT(*) BY CATEGORIZE(first_name)");
         query("from test | STATS COUNT(*) BY cat = CATEGORIZE(first_name)");
 
@@ -1759,6 +1761,8 @@ public void testCategorizeSingleGrouping() {
     }
 
     public void testCategorizeNestedGrouping() {
+        assumeTrue("requires Categorize capability", EsqlCapabilities.Cap.CATEGORIZE.isEnabled());
+
         query("from test | STATS COUNT(*) BY CATEGORIZE(LENGTH(first_name)::string)");
 
         assertEquals(
@@ -1772,6 +1776,8 @@ public void testCategorizeNestedGrouping() {
     }
 
     public void testCategorizeWithinAggregations() {
+        assumeTrue("requires Categorize capability", EsqlCapabilities.Cap.CATEGORIZE.isEnabled());
+
         query("from test | STATS MV_COUNT(cat), COUNT(*) BY cat = CATEGORIZE(first_name)");
 
         assertEquals(