Remove perf tests db connections settings. No db used even last time these were published Change-Id: I0d0497d6a407f07cb3673719a94585484ea5a6d2 Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.releng.buildtools/+/190478 Tested-by: Platform Bot <platform-bot@eclipse.org> Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>