Fix yaml() Jinja filter returning NULL on Pillar containers#69225
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Pillar dicts and lists are wrapped in salt.utils.secret.MaskedDict / MaskedList (dict / list subclasses) so their repr can redact secrets. SafeOrderedDumper has no representer for those subclasses, so safe_dump fell through to the add_representer(None, represent_undefined) catch-all and emitted the scalar "NULL". Register MaskedDict / MaskedList with the Ordered / SafeOrdered / IndentedSafeOrdered dumpers (and the base PyYAML dumpers used by salt.utils.yaml.dump) so they serialize as their underlying dict / list. Fixes saltstack#69218
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Pillar dicts and lists are wrapped in salt.utils.secret.MaskedDict / MaskedList (dict / list subclasses) so their repr can redact secrets. SafeOrderedDumper has no representer for those subclasses, so safe_dump fell through to the add_representer(None, represent_undefined) catch-all and emitted the scalar "NULL". Register MaskedDict / MaskedList with the Ordered / SafeOrdered / IndentedSafeOrdered dumpers (and the base PyYAML dumpers used by salt.utils.yaml.dump) so they serialize as their underlying dict / list.
Fixes #69218