feat: BI-6588 add group slug resolve to rls

[chl0rum]

No description provided.

[Copilot]

Pull request overview

Adds support for transitioning RLS group subjects from slug-based identifiers to real group IDs, including resolution of stored configs and runtime group matching.

Changes:

• Introduces helpers to detect slug-vs-ID group entries and to decide whether to fetch subject groups by slug or by real ID (or both during mixed/transition cases).
• Updates dataset load/save and data-api request preparation paths to resolve group slugs into real IDs and to fetch allowed groups accordingly.
• Adds/extends unit + integration tests and new resolved v2 RLS config fixture.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lib/dl_rls/dl_rls_tests/unit/test_utils.py	Adds unit tests for is_slug and rls_uses_real_group_ids.
lib/dl_rls/dl_rls_tests/unit/test_rls.py	Adds RLS matching tests covering slug-based and real-ID-based group entries.
lib/dl_rls/dl_rls/utils.py	Adds is_slug + rls_uses_real_group_ids utilities used by API layers.
lib/dl_rls/dl_rls/testing/rls_configs/dl_api_lib_group_config_resolved_v2.json	Adds a v2 fixture with resolved real group ID.
lib/dl_rls/dl_rls/subject_resolver.py	Makes resolve_group_slug explicitly unimplemented by default.
lib/dl_rls/dl_rls/init.py	Exposes selected dl_rls APIs via package-level exports.
lib/dl_api_lib_testing/dl_api_lib_testing/app.py	Extends test resolver to support by_id group fetch and slug-to-ID resolution.
lib/dl_api_lib/dl_api_lib_tests/db/data_api/test_rls.py	Adds a data-api test case using the resolved v2 group config.
lib/dl_api_lib/dl_api_lib_tests/db/control_api/test_rls.py	Adds control-api test validating slug resolution into v2 real IDs on save/load.
lib/dl_api_lib/dl_api_lib/app/data_api/resources/dataset/base.py	Updates runtime group resolution to fetch groups by slug vs ID depending on config.
lib/dl_api_lib/dl_api_lib/api_common/dataset_loader.py	Resolves group slugs to real IDs when persisting dataset RLS changes.

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