Add subtest for synthetics multistep tests (#2901)

Co-authored-by: ci.datadog-api-spec <[email protected]>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v1/openapi.yaml

@@ -3865,7 +3865,6 @@ components:
 
             points (group distributions use the roll-up modifier).'
           format: int64
-          minimum: 1
           type: integer
       type: object
     Host:

lib/datadog_api_client/v1/models/heat_map_widget_x_axis.rb

@@ -24,7 +24,7 @@ class HeatMapWidgetXAxis
     # Number of time buckets to target, also known as the resolution
     # of the time bins. This is only applicable for distribution of
     # points (group distributions use the roll-up modifier).
-    attr_reader :num_buckets
+    attr_accessor :num_buckets
 
     attr_accessor :additional_properties
 
@@ -67,24 +67,6 @@ def initialize(attributes = {})
       end
     end
 
-    # Check to see if the all the properties in the model are valid
-    # @return true if the model is valid
-    # @!visibility private
-    def valid?
-      return false if !@num_buckets.nil? && @num_buckets < 1
-      true
-    end
-
-    # Custom attribute writer method with validation
-    # @param num_buckets [Object] Object to be assigned
-    # @!visibility private
-    def num_buckets=(num_buckets)
-      if !num_buckets.nil? && num_buckets < 1
-        fail ArgumentError, 'invalid value for "num_buckets", must be greater than or equal to 1.'
-      end
-      @num_buckets = num_buckets
-    end
-
     # Returns the object in the form of hash, with additionalProperties support.
     # @return [Hash] Returns the object in the form of hash
     # @!visibility private