Bug: 448093 Move the initialization of the launch bar manager to job

We've seen a deadlock during startup mainly caused by CDT but triggered
when the launch bar manager initialized. This moves the init to a job
where it should be anyway to ensure smooth startup.

Change-Id: Id4b63e07dca3f96c561d6b4f45d60cf7cbcf530c
Reviewed-on: https://git.eclipse.org/r/35235
Tested-by: Hudson CI
Reviewed-by: Doug Schaefer <dschaefer@qnx.com>