[IMP] website: stop creating visitors and tracks for bots/crawlers

Before this commit, every visit on the website would create a visitor
and tracks, including visits from bots and crawlers (e.g. google bot).

Now, we prevent that as it doesn't bring any value to track those bots.

Note that it means there won't be any track created if you are using
tools like `ab` for perf investigation or `curl` commands.

task-2867045

Part-of: odoo/odoo#87857

addons/website/models/ir_http.py

@@ -133,6 +133,8 @@ class Http(models.AbstractModel):
 
     @classmethod
     def _register_website_track(cls, response):
+        if request.env['ir.http'].is_a_bot():
+            return False
         if getattr(response, 'status_code', 0) != 200 or request.httprequest.headers.get('X-Disable-Tracking') == '1':
             return False