[chore][processor/groupbyattrsprocessor] sort metadata.yaml entries (open-telemetry#43449)

#### Description

Sort metadata.yaml file in preparation for sort validation using
mdatagen. Context:
open-telemetry/opentelemetry-collector#13782

Signed-off-by: Paulo Dias <[email protected]>

Author: paulojmdias

processor/groupbyattrsprocessor/metadata.yaml

@@ -13,27 +13,17 @@ tests:
 
 telemetry:
   metrics:
-    processor_groupbyattrs_num_grouped_spans:
-      enabled: true
-      description: Number of spans that had attributes grouped
-      stability:
-        level: development
-      unit: "1"
-      sum:
-        value_type: int
-        monotonic: true
-    processor_groupbyattrs_num_non_grouped_spans:
+    processor_groupbyattrs_log_groups:
       enabled: true
-      description: Number of spans that did not have attributes grouped
+      description: Distribution of groups extracted for logs
       stability:
         level: development
       unit: "1"
-      sum:
+      histogram:
         value_type: int
-        monotonic: true
-    processor_groupbyattrs_span_groups:
+    processor_groupbyattrs_metric_groups:
       enabled: true
-      description: Distribution of groups extracted for spans
+      description: Distribution of groups extracted for metrics
       stability:
         level: development
       unit: "1"
@@ -48,26 +38,27 @@ telemetry:
       sum:
         value_type: int
         monotonic: true
-    processor_groupbyattrs_num_non_grouped_logs:
+    processor_groupbyattrs_num_grouped_metrics:
       enabled: true
-      description: Number of logs that did not have attributes grouped
+      description: Number of metrics that had attributes grouped
       stability:
         level: development
       unit: "1"
       sum:
         value_type: int
         monotonic: true
-    processor_groupbyattrs_log_groups:
+    processor_groupbyattrs_num_grouped_spans:
       enabled: true
-      description: Distribution of groups extracted for logs
+      description: Number of spans that had attributes grouped
       stability:
         level: development
       unit: "1"
-      histogram:
+      sum:
         value_type: int
-    processor_groupbyattrs_num_grouped_metrics:
+        monotonic: true
+    processor_groupbyattrs_num_non_grouped_logs:
       enabled: true
-      description: Number of metrics that had attributes grouped
+      description: Number of logs that did not have attributes grouped
       stability:
         level: development
       unit: "1"
@@ -83,9 +74,18 @@ telemetry:
       sum:
         value_type: int
         monotonic: true
-    processor_groupbyattrs_metric_groups:
+    processor_groupbyattrs_num_non_grouped_spans:
       enabled: true
-      description: Distribution of groups extracted for metrics
+      description: Number of spans that did not have attributes grouped
+      stability:
+        level: development
+      unit: "1"
+      sum:
+        value_type: int
+        monotonic: true
+    processor_groupbyattrs_span_groups:
+      enabled: true
+      description: Distribution of groups extracted for spans
       stability:
         level: development
       unit: "1"