feat: BI-6808 add always_deny auth method

[ovsds]

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[Copilot]

Pull request overview

This PR refactors the authentication system by renaming NoAuthChecker to AlwaysAllowAuthChecker for clarity and introduces a new AlwaysDenyAuthChecker that always denies authentication. This improves the semantic clarity of the authentication checkers and adds functionality for routes that should always be denied access.

Changes:

• Renamed NoAuthChecker to AlwaysAllowAuthChecker and NoAuthResult to AlwaysAllowAuthResult throughout the codebase
• Added new AlwaysDenyAuthChecker and AlwaysDenyAuthResult classes that always raise AuthFailureError
• Updated test endpoints from /api/v1/no_auth/ping to /api/v1/always_allow/ping and added /api/v1/always_deny/ping

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
lib/dl_app_api_base/dl_app_api_base/auth/checkers/no_auth.py	Removed the old NoAuthChecker implementation
lib/dl_app_api_base/dl_app_api_base/auth/checkers/always_allow.py	Added new AlwaysAllowAuthChecker (renamed from NoAuthChecker)
lib/dl_app_api_base/dl_app_api_base/auth/checkers/always_deny.py	Added new AlwaysDenyAuthChecker that always denies authentication
lib/dl_app_api_base/dl_app_api_base/auth/checkers/init.py	Updated exports to replace NoAuthChecker with new auth checkers
lib/dl_app_api_base/dl_app_api_base/auth/init.py	Updated auth module exports with renamed and new checkers
lib/dl_app_api_base/dl_app_api_base/init.py	Updated main module exports with renamed and new checkers
lib/dl_app_api_base/dl_app_api_base/app.py	Updated usage of NoAuthChecker to AlwaysAllowAuthChecker
lib/dl_app_api_base/dl_app_api_base_tests/unit/conftest.py	Updated test configuration with renamed checkers and new test routes
lib/dl_app_api_base/dl_app_api_base_tests/unit/auth/middleware/test_always_allow.py	Updated test to use new endpoint path /api/v1/always_allow/ping
lib/dl_app_api_base/dl_app_api_base_tests/unit/auth/middleware/test_always_deny.py	Added test for new AlwaysDenyAuthChecker functionality
lib/dl_app_api_base/dl_app_api_base_tests/unit/handlers/docs/expected_spec.json	Updated OpenAPI spec with new endpoint paths

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