dashboard/app: fix creation of bisection jobs

We limited the bugs query for bisection jobs at 300 bugs,
but that's not enough in presence of multiple namespaces.
Some namespaces did not get any bisections because all
bugs belonged to other namespaces/managers.
Fetch all bugs to fix this.

While we are here also simplify check for bisection crashes:
now we have FixBisectionDisabled as a property of manager,
so we don't need to fetch the crash build to check it.

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