[FIX] website_hr_recruitement: Mail not send at creation

When an applicant is created from the website
and the job_id has a first stage with a template to send
the mail is actually not sent.

This is happening because at the creation of
a mail.thread values from computed field don't
appear in the change to track.
so _message_track_post_template don't see the
change on stage_id and thus don't send the email

This is going to be fix on the master
in the meanwhile we can force the value of the stage_id
at the creation of the applicant from the website form

closes odoo/odoo#53462

X-original-commit: bbaf4913382809da0c4d644f914cb3e8191a5d1b
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/website_hr_recruitment/models/hr_recruitment.py

@@ -32,6 +32,13 @@ class Applicant(models.Model):
     def website_form_input_filter(self, request, values):
         if 'partner_name' in values:
             values.setdefault('name', '%s\'s Application' % values['partner_name'])
+        if values.get('job_id'):
+            stage = self.env['hr.recruitment.stage'].sudo().search([
+                ('fold', '=', False),
+                '|', ('job_ids', '=', False), ('job_ids', '=', values['job_id']),
+            ], order='sequence asc', limit=1)
+            if stage:
+                values['stage_id'] = stage.id
         return values