Show edit predictions usage in status bar menu (#29046)

This PR adds an indicator for edit predictions usage in the edit
predictions menu:

| Free | Zed Pro / Trial |
|
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|
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|
| <img width="235" alt="Screenshot 2025-04-18 at 9 53 47 AM"
src="https://github.com/user-attachments/assets/6da001d2-ef9c-49df-86be-03d4c615d45c"
/> | <img width="237" alt="Screenshot 2025-04-18 at 9 54 33 AM"
src="https://github.com/user-attachments/assets/31f5df04-a8e1-43ec-8af7-ebe501516abe"
/> |

Only visible to users on the new billing.

Release Notes:

- N/A

Cargo.lock

@@ -7107,10 +7107,12 @@ dependencies = [
 name = "inline_completion"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "gpui",
  "language",
  "project",
  "workspace-hack",
+ "zed_llm_client",
 ]
 
 [[package]]
@@ -7141,6 +7143,7 @@ dependencies = [
  "workspace",
  "workspace-hack",
  "zed_actions",
+ "zed_llm_client",
  "zeta",
 ]