[FIX] website: avoid creating duplicate key for configurator image

**Description of the issue/feature this PR addresses:**
- Increase user experience in creating website themes
- Eliminate redundant creation of 1 record leading to unnecessary model
`ir_model_data` contraints error

**Recreate the Situation**
- Install the website module
- Choose `a business website` in line 1, `fashion designer` in line 2,
`get lead` in line 3 on `configurator - step 2`
- Choose random paletee on `configurator - step 3`
- `Build my website` on `configurator - step 4`
- Suppose in this step that we have a bad connection to the api
`https://website.api.odoo.com`, the error `duplicate key value violates
unique constraint` will appear.

**Reason**
- When a user creates a website, the `configurator_apply` function is
called to the api `https://website.api.odoo.com`. If the connection time
exceeds 5s, the `configurator_apply` function will be called again.
Maximum of 3 times
- Each time `configurator_apply` function runs, will create records of
model `ir_model_data` at `set_images` function. This function will
create records with a name field like
`configurator_1_s_cover_default_image`.
- If this function runs again for the second time, it will also generate
a `configurator_1_s_cover_default_image` for the second time. This will
result in a `duplicate key value violates unique constraint` error.

**Before commit:**
- When creating a website theme by industry, if the user's connection to
odoo's api has a delay, it will cause an api contraints error of model
`ir_model_data`

**After commit:**
- Check if the record of model `ir_model_data` has been created before,
if created then skip

closes odoo/odoo#128959

X-original-commit: 56ccf4efeb946e2e0b6ef54b977b6d8b070306ee
Signed-off-by: Benoit Socias (bso) <bso@odoo.com>

addons/website/models/website.py

@@ -515,7 +515,15 @@ class Website(models.Model):
             page_view_id.save(value=''.join(rendered_snippets), xpath="(//div[hasclass('oe_structure')])[last()]")
 
         def set_images(images):
+            names = self.env['ir.model.data'].search([
+                ('name', '=ilike', f'configurator\\_{website.id}\\_%'),
+                ('module', '=', 'website'),
+                ('model', '=', 'ir.attachment')
+            ]).mapped('name')
             for name, url in images.items():
+                extn_identifier = 'configurator_%s_%s' % (website.id, name.split('.')[1])
+                if extn_identifier in names:
+                    continue
                 try:
                     response = requests.get(url, timeout=3)
                     response.raise_for_status()
@@ -531,7 +539,7 @@ class Website(models.Model):
                         'public': True,
                     })
                     self.env['ir.model.data'].create({
-                        'name': 'configurator_%s_%s' % (website.id, name.split('.')[1]),
+                        'name': extn_identifier,
                         'module': 'website',
                         'model': 'ir.attachment',
                         'res_id': attachment.id,