Use YAML.load to load classes beyond the basic types

https://bugzilla.redhat.com/show_bug.cgi?id=1789153

Followup to ManageIQ/manageiq#19701

At the very least, we know MiqExpression objects are in the YAML but other
custom classes could be in the YAML so we need to use YAML.load to return to the
prior behavior.

app/controllers/application_controller/miq_request_methods.rb

@@ -168,7 +168,7 @@ def set_pre_prov_vars
 
     unless %w[image_miq_request_new miq_template_miq_request_new].include?(params[:pressed])
       path_to_report = ManageIQ::UI::Classic::Engine.root.join("product", "views", provisioning_report).to_s
-      @view = MiqReport.new(YAML.safe_load(File.open(path_to_report), [Symbol]))
+      @view = MiqReport.new(YAML.load(File.open(path_to_report), [Symbol]))
       @view.db = get_template_kls.to_s
       report_scopes = %i[eligible_for_provisioning non_deprecated]
       options = options_for_provisioning(@view.db, report_scopes)

spec/controllers/application_controller/report_data_spec.rb

@@ -51,7 +51,7 @@
     it "use report_name when is passed" do
       report_name = "ProvisionCloudTemplates.yaml"
       path_to_report = ManageIQ::UI::Classic::Engine.root.join("product", "views", report_name).to_s
-      view = MiqReport.new(YAML.safe_load(File.open(path_to_report), [Symbol]))
+      view = MiqReport.new(YAML.load(File.open(path_to_report), [Symbol]))
       expect(controller).to_not receive(:get_db_view)
       controller.params = {:active_tree => "instances_tree"}
       controller.params = {:model_name => "ManageIQ::Providers::CloudManager::Template"}

spec/support/report_helper.rb

@@ -72,7 +72,7 @@ def numeric_chart_simple
       end
 
       def null_data_chart_with_basic_condition
-        exp = YAML.safe_load('--- !ruby/object:MiqExpression
+        exp = YAML.load('--- !ruby/object:MiqExpression
         exp:
           INCLUDES:
             field: Name
@@ -82,7 +82,7 @@ def null_data_chart_with_basic_condition
       end
 
       def null_data_chart_with_complex_condition
-        exp = YAML.safe_load('--- !ruby/object:MiqExpression
+        exp = YAML.load('--- !ruby/object:MiqExpression
         exp:
           and:
           - IS: