define/emit some metrics for windows sandbox setup (#9573)

This should give us visibility into how users are using the elevated
sandbox nux flow, and the timing of the elevated setup.

codex-rs/Cargo.lock

@@ -1756,6 +1756,7 @@ dependencies = [
  "codex-feedback",
  "codex-file-search",
  "codex-login",
+ "codex-otel",
  "codex-protocol",
  "codex-utils-absolute-path",
  "codex-utils-cargo-bin",
@@ -1831,6 +1832,7 @@ dependencies = [
  "codex-feedback",
  "codex-file-search",
  "codex-login",
+ "codex-otel",
  "codex-protocol",
  "codex-tui",
  "codex-utils-absolute-path",