lrms defaultqueue optional parameter (Fixes BUGZ-4193)
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This merge request is automatically cherrypicked from !1771 (merged) from source branch https://source.coderefinery.org/maikenp/arc/-/tree/bugz_4193_defaultqueue orginally made by @maikenp .
The original MR went to branch: https://source.coderefinery.org/nordugrid/arc/-/tree/next
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Do not check allowed values for lrms, and handle defaultqueue existence