Return final and intermediate apportionment steps

[Lionqueen94]

Closes #737

Description

• Adds data structure to report final and intermediate apportionment steps, to be used by the frontend and the eml & pdf generators (@Lionqueen94 & @praseodym)
• Add oneOf support to OpenAPI generator (@praseodym)
• Removed the unused DataEntryStatus type from the OpenAPI spec and fixes the build without the dev-database feature by always including the ElectionRequest struct. (@praseodym)

[github-actions]

Sigrid maintainability feedback

⚠️ Your code did not improve maintainability towards your objective of 3.5 stars

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Sigrid compared your code against the baseline of 2025-01-23.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

Unfortunately, 11 refactoring candidates were introduced or got worse.

Risk	System property	Location
🔴	Duplication (Introduced)	backend/src/election/structs.rs (lines 10-19) backend/src/election/structs.rs (lines 29-38)
🔴	Duplication (Introduced)	backend/src/apportionment/mod.rs (lines 224-229) backend/src/apportionment/mod.rs (lines 299-304)
🔴	Unit Size (Worsened)	backend/src/apportionment/mod.rs allocate_remaining_seats(PoliticalGroupVotes,BTreeMap,Fraction,u64,u64)
🟠	Unit Size (Introduced)	backend/src/apportionment/mod.rs perform_highest_average_allocation(u64,PoliticalGroupVotes,BTreeMap,BTreeMap,u64,Option)
🟠	Unit Size (Worsened)	backend/src/apportionment/mod.rs seat_allocation(u64,ElectionSummary)
🟠	Unit Size (Worsened)	frontend/scripts/openapi/generator.ts generator.ts.addDefinition(string,ReferenceObject
🟠	Unit Complexity (Worsened)	frontend/scripts/openapi/generator.ts generator.ts.addDefinition(string,ReferenceObject
🟠	Unit Interfacing (Introduced)	backend/src/apportionment/mod.rs perform_highest_average_allocation(u64,PoliticalGroupVotes,BTreeMap,BTreeMap,u64,Option)
⚫️		+ 3 more

📚 Remaining technical debt

9 refactoring candidates didn't get better or worse, but are still present in the code you touched.

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⭐️ Sigrid ratings

System property	System on 2025-01-23	Before changes	New/changed code
Volume	5.2	N/A	N/A
Duplication	3.5	4.3	4.4
Unit Size	2.2	1.5	1.5
Unit Complexity	3.2	3.3	3.0
Unit Interfacing	3.0	1.9	1.4
Module Coupling	3.9	5.5	5.5
Component Independence	2.9	N/A	N/A
Component Entanglement	3.6	N/A	N/A
Maintainability	3.4	3.5	3.3

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[praseodym]

• enum RestSeatAllocationDetails is not being added to openapi.ts by the gen_openapi_types.ts script causing error in openapi.ts

Fixed with 70fade5

The base branch was changed.