Make analyzer REST languages configurable with SUPPORTED_LANGUAGES

[rodboev]

Change Description

Add a runtime supported-languages override for the analyzer REST service so /supportedentities and /recognizers can expose non-English recognizers without requiring a custom analyzer YAML mount.

Issue reference

Fixes #1058

Verification

• cd presidio-analyzer && poetry run pytest tests/test_analyzer_engine_provider.py tests/test_app.py — 46 passed, 3 skipped, 21 warnings in 38.67s
• cd presidio-analyzer && poetry run ruff check app.py presidio_analyzer/analyzer_engine_provider.py tests/test_analyzer_engine_provider.py tests/test_app.py — All checks passed!

The Poetry environment initially lacked the analyzer test dependencies, and poetry install --no-interaction --no-root timed out after 120 seconds. The checks passed after installing the required runtime and test dependencies into the package Poetry environment. The three skipped tests are the existing optional engine cases.

Note on CHANGELOG

This change adds a user-visible server configuration input, so CHANGELOG.md under Unreleased should be updated.

Checklist

• Tests added and passing
• Lint checks passing
• Documentation updated if needed
• Changelog updated
• I have read the contribution guidelines