feat(Icons): Add tenancy icon (#1868)

## 📝 Changes

Just adds the Tenancy icon

<img width="216" height="144" alt="CleanShot 2026-01-13 at 11 07 45@2x"
src="https://github.com/user-attachments/assets/c418d49a-7376-4afc-b994-f2dc552e3bc6"
/>

## ✅ Checklist

Easy UI has certain UX standards that must be met. In general,
non-trivial changes should meet the following criteria:

- [x] Visuals match Design Specs in Figma
- [x] Stories accompany any component changes
- [x] Code is in accordance with our style guide
- [x] Design tokens are utilized
- [x] Unit tests accompany any component changes
- [x] TSDoc is written for any API surface area
- [x] Specs are up-to-date
- [x] Console is free from warnings
- [x] No accessibility violations are reported
- [x] Cross-browser check is performed (Chrome, Safari, Firefox)
- [x] Changeset is added

Author: ralexmatthews

.changeset/plenty-mangos-shine.md

@@ -0,0 +1,5 @@
+---
+"@easypost/easy-ui-icons": minor
+---
+
+Adds Tenancy icon

easy-ui-icons/src/Tenancy.json

@@ -0,0 +1,5 @@
+{
+  "name": "tenancy",
+  "style": "outlined",
+  "source": "@material-symbols/svg-300"
+}