Expand coverage for multieval paths

[Anilm3]

What does this PR do?

Improve test coverage for the multieval/context-object-store changes by adding focused tests for missing success/error paths in context/subcontext eval APIs and object store queue behavior, and reconcile the branch with the latest baseline branch state.

Motivation

Recent multieval and queue-processing changes introduced new branches that were not fully exercised by tests. This update targets those uncovered paths to move patch coverage for the touched files toward full coverage and prevent regressions in context/subcontext evaluation behavior. The baseline branch also moved forward, so this update resolves merge conflicts to keep the PR reviewable.

Additional Notes

Changes were limited to tests and conflict reconciliation (no new functional behavior introduced beyond keeping baseline-side interface behavior during merge conflict resolution).

Files covered by the added tests:

• tests/unit/object_store_test.cpp
• tests/unit/evaluation_engine_test.cpp
• tests/integration/interface/context/result/test.cpp
• tests/integration/interface/context/multieval/test.cpp

Conflict reconciliation touched:

• src/interface.cpp
• tests/integration/context/test.cpp
• tests/integration/interface/context/multieval/test.cpp

Coverage-focused additions include:

• object_store insert-and-apply invalid input path
• object_store queued batch flushing behavior (apply without marking targets as new)
• context/subcontext map_view overload insertion paths
• context/subcontext array_view multibatch invalid-shape paths
• context/subcontext eval invalid object path when alloc is null
• context/subcontext multieval internal error paths when user allocator throws

Describe how to test your changes

• Resolve/refresh branch against baseline branch and ensure no unresolved conflict markers remain.
• Attempted to build and run tests with:
  • cmake -S . -B build -DLIBDDWAF_TESTING=ON -DCMAKE_BUILD_TYPE=Debug
  • cmake --build build --target waf_test -j4
• Build/test execution is currently blocked in this sandbox because external dependencies failed to download (HTTP 502 for googletest, yaml-cpp, and rapidjson).
• Ran code quality checks on conflict-resolved files:
  • clang-format -i src/interface.cpp tests/integration/interface/context/multieval/test.cpp

Checklist

• The CHAMGELOG.md has been updated
• Unit tests have been updated and pass
• If known, an appropriate milestone has been selected

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