Model property deprecation_date (#3579)

## What are you changing in this pull request and why?

Adding new model property `deprecation_date`
Create new model property card
Add to existing table of properties

## Checklist
Uncomment if you're publishing docs for a prerelease version of dbt
(delete if not applicable):
- [x] Add versioning components, as described in [Versioning
Docs](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-entire-pages)
- [TODO] Add a note to the prerelease version [Migration
Guide](https://github.com/dbt-labs/docs.getdbt.com/tree/current/website/docs/guides/migration/versions)
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [x] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):
- [x] Add page to `website/sidebars.js`
- [x] Provide a unique filename for the new page

Link to Core repo PR

dbt-labs/dbt-core#7562

website/dbt-versions.js

@@ -31,6 +31,10 @@ exports.versions = [
 ]
 
 exports.versionedPages = [
+  {
+    "page": "reference/resource-properties/deprecation_date", 
+    "firstVersion": "1.6",
+  },
   {
     "page": "reference/commands/retry",
     "firstVersion": "1.6",

website/docs/reference/model-properties.md

@@ -17,6 +17,7 @@ models:
     [docs](/reference/resource-configs/docs):
       show: true | false
     [latest_version](/reference/resource-properties/latest_version): <version_identifier>
+    [deprecation_date](/reference/resource-properties/deprecation_date): <YAML_DateTime>
     [access](/reference/resource-properties/access): private | protected | public
     [config](/reference/resource-properties/config):
       [<model_config>](/reference/model-configs): <config_value>

website/docs/reference/resource-properties/deprecation_date.md

@@ -0,0 +1,32 @@
+---
+resource_types: [models]
+datatype: deprecation_date
+required: no
+---
+
+<File name='models/<schema>.yml'>
+
+```yml
+models:
+  - name: my_model
+    description: deprecated
+    deprecation_date: 1999-01-01 00:00:00.00+00:00
+```
+</File>
+
+<File name='models/<schema>.yml'>
+
+```yml
+version: 2
+models:
+  - name: my_model
+    description: deprecating in the future
+    deprecation_date: 2999-01-01 00:00:00.00+00:00
+```
+
+</File>
+
+## Definition
+
+The deprecation date of the model in YAML DateTime format. 
+

website/sidebars.js

@@ -594,6 +594,7 @@ const sidebarSettings = {
             "reference/resource-properties/columns",
             "reference/resource-properties/config",
             "reference/resource-properties/constraints",
+            "reference/resource-properties/deprecation_date",
             "reference/resource-properties/description",
             "reference/resource-properties/latest_version",
             "reference/resource-properties/include-exclude",