Use dbus_utils::NameHasOwner and fix log spam in IdleLinux

* Use dbus_utils::NameHasOwner() instead of making the call manually
* Use CallMethodWithErrorResponse() instead of CallMethod() to
  prevent automatic error logging since errors are expected depending
  on platform support.

R=pbos

Bug: None
Change-Id: I3642dc28be53d87947572e2538a319913e879be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6068189
Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1391858}