[IMP] base_automation: modular kanban header action

This commit makes it possible to have the same 'Automation' button hook
in this module (in community) and in web_enterprise (which is in the
Enterprise edition, as one may have guessed).

The purpose of the override in web_enterprise is to promote Odoo Studio
as the module to install to enjoy automations. Including this Studio
promotion in Odoo CE makes little sense, especially since only
base_automation is actually needed. Therefore we needed to have both a
promotion button in EE and an actual button in CE but not both when
base_automation was installed along with web_enterprise.

This commit simply adds an intermediary function on the KanbanHeader
component, which calls an indirect function that is only defined
in base_automation. In that way, the web_enterprise module can
override the intermediary function and can check the existence of
the indirect function.

Task-3085360

Part-of: odoo/odoo#114352

addons/base_automation/static/src/kanban_header_patch.js

@@ -67,6 +67,10 @@ patch(KanbanHeader.prototype, {
     },
 
     async openAutomations() {
+        return this._openAutomations();
+    },
+
+    async _openAutomations() {
         const domain = [["model", "=", this.props.list.resModel]];
         const modelId = await this.orm.search("ir.model", domain, { limit: 1 });
         const context = {