Chore: Remove bus from plugin context service (#45633)

* Chore: Remove bus from plugin context

* fix the plugincontext

Co-authored-by: Ying WANG <ying.wang@grafana.com>

pkg/plugins/plugincontext/plugincontext.go

@@ -114,7 +114,7 @@ func (p *Provider) getCachedPluginSettings(ctx context.Context, pluginID string,
 	}
 
 	query := models.GetPluginSettingByIdQuery{PluginId: pluginID, OrgId: user.OrgId}
-	if err := p.Bus.Dispatch(ctx, &query); err != nil {
+	if err := p.PluginSettingsService.GetPluginSettingById(ctx, &query); err != nil {
 		return nil, err
 	}