Gerrit authentication fails on macOS due to hardcoded git-remote-sso path

Referencing line 13 of `src/features/gerrit/auth/auth_client_sso.ts` (https://github.com/google/chromiumide/blob/80440121a3b14baf4424e90e79c8c7faf91ff45b/src/features/gerrit/auth/auth_client_sso.ts#L13), the path to `git-remote-sso` is hardcoded to `/usr/bin/git-remote-sso`. On macOS, this binary is not located in `/usr/bin`, which causes Gerrit authentication to fail.