Allow removing implicit quadlet systemd dependencies

Quadlet inserts network-online.target Wants/After dependencies to ensure pulling works.
Those systemd statements cannot be subsequently reset.

In the cases where those dependencies are not wanted, we add a new
configuration item called `DefaultDependencies=` in a new section called
[Quadlet]. This section is shared between different unit types.

fixes #24193

Signed-off-by: Farya L. Maerten <me@ltow.me>
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