workflows/eval: remove separate attrpaths step

This was only separate to work around possible delays from the target
branch's eval workflow. With the switch to the merge queue, this delay
is impossible - the relevant target commit will only appear once Eval
has completed in the merge queue, so Eval will be guaranteed to have
finished.

By running attrpaths and outpaths in the same step, we share ~10 seconds
of eval time, traversing through all of Nixpkgs.

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