Esql - fix some test failures due to results ordering (#118692)

fix some failing multi-shard tests. The backport for the PR that added these tests hasn't landed yet, so I'm going to just cherry pick this into there rather than do two back ports with conflict resolution.

Author: not-napoleon

x-pack/plugin/esql/qa/testFixtures/src/main/resources/date_nanos.csv-spec

@@ -555,7 +555,8 @@ required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY yr = BUCKET(nanos, 1 year);
+| STATS ct = count(*) BY yr = BUCKET(nanos, 1 year)
+| SORT yr DESC;
 
 ct:long | yr:date_nanos
 8       | 2023-01-01T00:00:00.000000000Z 
@@ -567,7 +568,8 @@ required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY yr = BUCKET(nanos, 5, "1999-01-01", NOW());
+| STATS ct = count(*) BY yr = BUCKET(nanos, 5, "1999-01-01", NOW())
+| SORT yr DESC;
 
 ct:long | yr:date_nanos
 8       | 2023-01-01T00:00:00.000000000Z 
@@ -579,7 +581,8 @@ required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY mo = BUCKET(nanos, 1 month);
+| STATS ct = count(*) BY mo = BUCKET(nanos, 1 month)
+| SORT mo DESC;
 
 ct:long | mo:date_nanos
 8       | 2023-10-01T00:00:00.000000000Z 
@@ -591,7 +594,8 @@ required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY mo = BUCKET(nanos, 20, "2023-01-01", "2023-12-31");
+| STATS ct = count(*) BY mo = BUCKET(nanos, 20, "2023-01-01", "2023-12-31")
+| SORT mo DESC;
 
 ct:long | mo:date_nanos
 8       | 2023-10-01T00:00:00.000000000Z 
@@ -603,18 +607,21 @@ required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY mo = BUCKET(nanos, 55, "2023-01-01", "2023-12-31");
+| STATS ct = count(*) BY mo = BUCKET(nanos, 55, "2023-01-01", "2023-12-31")
+| SORT mo DESC;
 
 ct:long | mo:date_nanos
 8       | 2023-10-23T00:00:00.000000000Z 
 ;
+
 Bucket Date nanos by 10 minutes
 required_capability: date_trunc_date_nanos
 required_capability: date_nanos_bucket
 
 FROM date_nanos 
 | WHERE millis > "2020-01-01" 
-| STATS ct = count(*) BY mn = BUCKET(nanos, 10 minutes);
+| STATS ct = count(*) BY mn = BUCKET(nanos, 10 minutes)
+| SORT mn DESC;
 
 ct:long | mn:date_nanos                 
 4       | 2023-10-23T13:50:00.000000000Z