[DMP Review] enable multiple combined evaluations of relations for conditions

Rationale / Begründung

Conditions are currently targeting only one attribute and are resolved for a single relation.
It should be possible to evaluate multiple attributes in one condition each against different target texts/options.

These conditions can be connected via AND or OR.

In the edit Condition interface:

• support for multiple sources that can be related via "AND / OR", for example via a tabbed menu interface.
• Add a tab view for each source allowing the user to add or remove it
• Add a Radio-button "AND / OR" to switch between the type of conditional

PS it might sound like a ConditionSet but it should be editable as a normal Condition in order to not overflow the UI with complexity.

Affected

Users, Managers

Minimal functionality

• allow for multiple relations that are combined when a Condition is resolved
• add the required new settings to the edit Condition interface

Nice-to-have functionality

References / Verweise

• https://github.com/search?q=repo%3Ardmorganiser%2Frdmo+%5BDMP+Review%5D&type=issues
• https://github.com/rdmorganiser/rdmo/blob/c945d7d9ef5efdccb2d7b41b914ff50ea6f7b49c/rdmo/conditions/models.py#L118

Start with rdmo/conditions/models.py around the referenced Condition definition, then trace the Condition edit interface and its resolution flow. Define how multiple relations are represented and combined with AND or OR, and how sources can be added or removed. Done means a Condition supports multiple combined relations and the edit interface exposes the required settings.