[Icon] Add dynamic source connect icon (#11478)

![datasource-connect](https://github.com/Shopify/polaris/assets/4304867/ad60005e-9f33-449a-9438-9a53d3d0c168)

### Adds support for dynamic source connect icon
* This icon is used when a dynamic source is connected, and powering
part of the experience: either data, or functionality.
* This icon is used in context of Shopify Admin, and Shopify Mobile for
merchandising flows.

### WHY are these changes introduced?
* Provides additional specificity in how we communicate dynamic source
connections in admin and online store

### WHAT is this pull request doing?
* Adds support for dynamic source connect icon
* Updates description for add dynamic source icon

### How to 🎩

🖥 [Local development
instructions](https://github.com/Shopify/polaris/blob/main/README.md#install-dependencies-and-build-workspaces)
🗒 [General tophatting
guidelines](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md)
📄 [Changelog
guidelines](https://github.com/Shopify/polaris/blob/main/.github/CONTRIBUTING.md#changelog)

### 🎩 checklist

- [ ] Tested a
[snapshot](https://github.com/Shopify/polaris/blob/main/documentation/Releasing.md#-snapshot-releases)
- [ ] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [ ] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [ ] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [ ] Updated the component's `README.md` with documentation changes
- [ ] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

---------

Co-authored-by: Kyle Durand <kyledurand@users.noreply.github.com>
Co-authored-by: kyledurand <kyle.durand@shopify.com>

.changeset/six-pumpkins-mix.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris-icons': minor
+---
+
+Added DatabaseConnectIcon

polaris-icons/icons/DatabaseAddIcon.yml

@@ -1,7 +1,6 @@
 name: Database add
 description: >-
-  Used to represent inserting a dynamic source into an input field that supports
-  multiple dynamic sources
+  Used to represent adding, inserting, or connecting a dynamic source.
 keywords:
   - dynamic source
   - data source

polaris-icons/icons/DatabaseConnectIcon.yml

@@ -0,0 +1,16 @@
+name: Database
+description: Used to represent a dynamic source
+keywords:
+  - dynamic source
+  - data source
+  - dynamic
+  - data
+  - datasource
+  - dynamicsource
+  - db
+  - database
+authors:
+  - Russell Baylis
+  - Joe Thomas
+date_added: 2022-09-06
+date_modified: 2023-06-23