Add query and write tests for findAndModify

[vic-tsang]

This PR contains:

• query and write tests for findAndModify

Note: I have omitted the following tests as it's already covered in the respective files:

• Collation matching, sort, and remove behavior with findAndModify (5 cases)

  • Covered by: core/collation/command_level/operations/test_operations_find_and_modify.py (14 cases, superset)

• Collation missing locale validation error (1 case)

  • Covered by: core/collation/command_level/operations/test_operations_find_and_modify.py → validation_missing_locale

• findAndModify rejected on views

  • Covered by: core/collections/views/test_views_write_rejection.py → find_and_modify_rejected

• findAndModify update rejected on timeseries collections

  • Covered by: core/collections/timeseries/test_timeseries_updates.py → find_and_modify_update_rejected

• findAndModify update succeeds on capped collections

  • Covered by: core/collections/capped_collections/test_capped_collections_write_position.py → test_capped_find_and_modify_position (stronger
    test that also verifies position preservation)

Ref:

• Issue Add compatibility test for core: query and write (8 total) #39

[documentdb-triage-tool]

🤖 Auto-triaged by documentdb-triage-tool.

Applied: compatibility test, enhancement
Project fields suggested: Component test-coverage · Priority P2 · Effort XL · Status Needs Review
Confidence: 0.85 (mixed)

Reasoning

component from path globs (test-coverage); effort from diff stats (2854+0 LOC, 11 files); LLM: Adds new query and write compatibility tests for findAndModify, expanding test coverage under documentdb_tests/compatibility/tests/.

If a label is wrong, remove it manually and ping @patty-chow so the rules can be tuned. The bot will not re-label items that already have component labels.

[SaiPradyumn]

nit: test_findAndModify_update_modes.py contains two standalone tests that belong elsewhere:

• test_findAndModify_upsert_unique_index_updates_instead_of_dup → belongs in test_findAndModify_upsert.py
• test_findAndModify_upsert_array_filters_no_matching_array → also more of an upsert or arrayFilters edge case
  than "update modes"