Currently, an exception is generated when the user tries to access embed view of slides by following the steps:
 - Install "eLearning" with a demo data
 - Open external embed view of slide 1 by "/slides/embed_external/1" in url

Stack Trace:
```
AttributeError: 'slide.channel' object has no attribute 'website_share_url'
  File "<1405>", line 313, in template_1405
  File "<1405>", line 151, in template_1405_content
  File "<1405>", line 18, in template_1405_t_call_0
QWebException: Error while render the template
AttributeError: 'slide.channel' object has no attribute 'website_share_url'
Template: ir.ui.view(1405,)
Path: /t/html/body/div/div[2]/t[1]/t/t[4]
Node: <t t-set="include_embed" t-value="True"/>
```

This error is because commit [1] added code that tries to access the
'website_share_url' field in the 'slide.channel' model in template
'embed_slide' , but it actually belongs to 'slide.slide'.

This commit resolved the above issue by accessing "website_share_url" with "slide" instead of "slide.channel".

[1] - https://github.com/odoo/odoo/commit/db63c03af9932ae4d9b786620e88e62ce938589a

sentry-5095823727

Forward-Port-Of: odoo/odoo#159446
Forward-Port-Of: odoo/odoo#159238

After version >= `16.4` module **repair** is **[using](https://github.com/odoo/odoo/blob/c002aad906bef390d6d7fd5c795a8e6baa5fd31d/addons/repair/models/repair.py#L571-L578)** attribute `_get_default_warehouse_id` which is **[defined](https://github.com/odoo/odoo/blob/c002aad906bef390d6d7fd5c795a8e6baa5fd31d/addons/sale_stock/models/res_users.py#L12-L17)** in module `sale_stock`. There is no dependency between that 2 modules.

But as the module `sale_stock` is **autoinstall=1** and its all dependencies are being installed when we install `repair` the module **sale_stock** is also being installed automatically. That is why when we install **repair** we will not have any problem on using that attribute. If we uninstall that `sale_stock` we will have problem because `repair` module will not be able to find the attribute `_get_default_warehouse_id`.

For fixing the issue I added that attribute in module `stock` as it is dependent for both of `repair` and `sale_stock`, and also I use the inheritence in module `sale_stock`

**Steps to reproduce:**

1. Install `repair` on `16.0`
2. Uninstall `sale_stock`
3. Try to upgrade to `17.0`

You will error similar to this:

```
 File "/home/odoo/src/odoo/17.0/addons/repair/models/repair.py", line 28, in _default_picking_type_id
    return self._get_picking_type().get((self.env.company, self.env.user))
  File "/home/odoo/src/odoo/17.0/addons/repair/models/repair.py", line 563, in _get_picking_type
    default_warehouse = self.env.user.with_company(companies.id)._get_default_warehouse_id()
AttributeError: 'res.users' object has no attribute '_get_default_warehouse_id'
```

upg-1565705

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:


---
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Forward-Port-Of: odoo/odoo#166006