zeta: Do not show usage for copilot/supermaven (#30563)

Follow up to #29952

Release Notes:

- Fix an issue where zeta usage would show up when using Copilot as an
edit prediction provider

Cargo.lock

@@ -7225,7 +7225,6 @@ dependencies = [
  "lsp",
  "paths",
  "project",
- "proto",
  "regex",
  "serde_json",
  "settings",
@@ -7233,7 +7232,6 @@ dependencies = [
  "telemetry",
  "theme",
  "ui",
- "util",
  "workspace",
  "workspace-hack",
  "zed_actions",