Fix aggregated relation parsing for stored queries

[acwhite211]

Fixes #8040

Fixes saved stored queries where (aggregated) to-many relationship fields, like Collecting Event > Collectors (aggregated), were parsed incorrectly after reload. The parser was treating the repeated relationship name in the saved string id as a tree rank, which caused query execution to join through the related table directly and return duplicate rows instead of one aggregated value. Solved by preserving already parsed to-many relation fields when reading saved stored query string ids.

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list

Testing instructions

#8040 (comment)

• Open Query Builder for Collection Object.
• Add a display field for Collecting Event > Collectors (aggregated).
• Use test data where one collection object’s collecting event has multiple collectors.
• Run the query and verify the collection object appears once, with all collectors shown in the aggregated collectors cell.
• Save the query, reopen it, and run it again.
• Verify the reopened query still returns one row per collection object and does not split collectors into duplicate rows.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
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[emenslin]

• Verify the reopened query still returns one row per collection object and does not split collectors into duplicate rows.

Looks good, results return only one row!