https://linear.app/unleash/issue/2-1817/ui-create-an-incoming-webhooks-configuration-page
This adds an incoming webhooks page with the respective table. We plan
on possibly extending the table with a couple more columns in a future
PR.
This allows us:
- View all configured incoming webhooks;
- Copy their URL to the clipboard;
- Remove them;
For "new" and "edit" operations we still need the incoming webhooks
form/dialog, coming in a future PR.
**Note**: Even though we are showing the full URL in the table for now,
we may end up truncating its start in the future (e.g.
`.../api/incoming-webhook/<webhook-name>` - This decision depends on how
it will look like after the rest of the columns are added.
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