What this PR does / why we need it:

get_historical_features_ibis, which the DuckDB offline store and the contrib Oracle and MSSQL stores use, took a projection's join_key_map as the whole list of join keys whenever the map was not empty. When with_join_key_map renamed only some keys of a feature view with several entities, the other keys were left out of the point-in-time join predicates and of entity_row_id. Each entity row then got the latest value for the renamed key alone, taken from any value of the other keys.

Feature view keyed on user_id and merchant_id, used as .with_join_key_map({"user_id": "sender_id"}). User 1 spent 10 at merchant 100 and 99 at merchant 200:

Before:
 sender_id  merchant_id  spend
         1          100     99
         1          200     99
After:
 sender_id  merchant_id  spend
         1          100     10
         1          200     99

get_online_features on the same store already returns 10 and 99.

The map is now built from the feature view's entity columns, and every key the projection does not rename keeps its own name (join_key_map.get(name, name)), as in the Dask store and offline_utils.get_feature_view_query_context. The new _join_key_map() is used for both the join predicates and entity_row_id.

Adds test_get_historical_features_keeps_join_keys_left_out_of_join_key_map to test_ibis.py. It fails on master ({100: 99, 200: 99}) and passes with this change.

Which issue(s) this PR fixes:

Fixes #7158

Checks

• I've made sure the tests are passing.
• My commits are signed off (git commit -s)
• My PR title follows conventional commits format

Testing Strategy

• Unit tests
• Integration tests
• Manual tests
• Testing is not required for this change

Misc

Run locally:

• test_ibis.py: 11 passed.
• The other related unit tests give the same results as on master, plus the new test (103 passed): the Dask, created-timestamp, SQL entity-row-id and hybrid offline store tests, plus test_feature_service.py, test_utils_entity_maps.py and test_unit_feature_store.py. test_offline_store.py was not collected locally because psycopg is not installed.
• ruff 0.16.10 and mypy 1.11.2 pass on the changed files.
• Manual check: the reproducer from the issue.