Replace ddm_quota attribute by dm_weight

[amaltaro]

Impact of the new feature
WM in general

Is your feature request related to a problem? Please describe.
As reasonably discussed in this GH issue:#12044
and 3 months ago when dm_weight was deployed in Rucio, we need to move away from the ddm_quota.

The dm_weight RSE attribute is a value normalized between 0 and 100, meant to reflect how usable an RSE is (e.g. storage available, etc).

Describe the solution you'd like
We need to update both:

• WMCore codebase
• and services_config service configuration repo (in all 3 branches)
  to stop using the ddm_quota as a default value, likely switching it over to the dm_weight one.

NOTE that this documentation https://gitlab.cern.ch/dmwm/wmcore-docs/-/blob/master/docs/wmcore/Rucio-rules-created-by-WM.md?ref_type=heads needs to be updated accordingly.

TBD: we still have to discuss with the DM team whether we can simply use this attribute, or if we have to also verify the Rucio account storage space available before making input data placements (primary and pileup datasets).

Describe alternatives you've considered
Details of how to implement it for input data placement are yet to be discussed.

Additional context
None