Plugins: Make renderer service load renderer plugin (#77854)

* rendering service loads renderer plugin

* update naming

* tidy

* apply PR feedback

* fix missing feature manager

* fix step

* set plugin

pkg/plugins/manager/pipeline/discovery/steps.go

@@ -2,6 +2,7 @@ package discovery
 
 import (
 	"context"
+	"slices"
 
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/plugins/config"
@@ -53,3 +54,39 @@ func (d *DuplicatePluginValidation) Filter(ctx context.Context, bundles []*plugi
 
 	return res, nil
 }
+
+// PermittedPluginTypesFilter is a filter step that will filter out any plugins that are not of a permitted type.
+type PermittedPluginTypesFilter struct {
+	permittedTypes []plugins.Type
+}
+
+// NewPermittedPluginTypesFilterStep returns a new FindFilterFunc for filtering out any plugins that are not of a
+// permitted type. This includes both the primary plugin and any child plugins.
+func NewPermittedPluginTypesFilterStep(permittedTypes []plugins.Type) FindFilterFunc {
+	f := &PermittedPluginTypesFilter{
+		permittedTypes: permittedTypes,
+	}
+	return f.Filter
+}
+
+// Filter will filter out any plugins that are not of a permitted type.
+func (n *PermittedPluginTypesFilter) Filter(_ context.Context, _ plugins.Class, bundles []*plugins.FoundBundle) ([]*plugins.FoundBundle, error) {
+	var r []*plugins.FoundBundle
+	for _, b := range bundles {
+		if !slices.Contains(n.permittedTypes, b.Primary.JSONData.Type) {
+			continue
+		}
+
+		prohibitedType := false
+		for _, child := range b.Children {
+			if !slices.Contains(n.permittedTypes, child.JSONData.Type) {
+				prohibitedType = true
+				break
+			}
+		}
+		if !prohibitedType {
+			r = append(r, b)
+		}
+	}
+	return r, nil
+}