feat: add redesigned organization settings sidebar (#15932)

resolves coder/internal#173, coder/internal#175

This PR does the following
1. Updates the left sidebar for organizations to use a dropdown to
select the organization
2. Move the create organization button inside the dropdown
3. Update the design of the create organization page
4. Do not display the organization in the dropdown if there is only 1
org to display

Figma:
https://www.figma.com/design/OR75XeUI0Z3ksqt1mHsNQw/Dashboard-v1?node-id=139-1380&m=dev

The loading state for the save button in the create organization form
will be handled separately after #14978 is completed.

Note: Since the dropdown is based off the cmdk component, navigation in
the dropdown is handled by the arrow keys, https://cmdk.paco.me/

<img width="560" alt="Screenshot 2025-01-03 at 21 11 26"
src="https://github.com/user-attachments/assets/ff6e61ab-c8d4-4f97-b603-306492e9bfec"
/>
<img width="641" alt="Screenshot 2025-01-03 at 21 11 39"
src="https://github.com/user-attachments/assets/fedb28e0-9ef3-4b0f-8665-06215338f351"
/>
<img width="1178" alt="Screenshot 2025-01-03 at 21 12 05"
src="https://github.com/user-attachments/assets/ee672533-2689-4b2e-a7bf-471ea72e1095"
/>
<img width="1177" alt="Screenshot 2025-01-03 at 21 12 39"
src="https://github.com/user-attachments/assets/f13824a6-2581-4bff-b5b6-2024c2e145a4"
/>

pnpm-lock.yaml

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+  fastq@1.18.0:
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@@ -376,7 +376,7 @@ snapshots:
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-      fastq: 1.17.1
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   '@pkgjs/parseargs@0.11.0':
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@@ -431,7 +431,7 @@ snapshots:
 
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-  fast-glob@3.3.2:
+  fast-glob@3.3.3:
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@@ -441,7 +441,7 @@ snapshots:
 
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-  fastq@1.17.1:
+  fastq@1.18.0:
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@@ -478,7 +478,7 @@ snapshots:
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       slash: 5.1.0