Add legacy job submission fallback

[guerler]

This PR completes the /api/tools → /api/jobs migration by adding a minimal fallback.

The client routes through submitAsync only when three conditions hold:

1. enable_tool_requests is enabled (default true, exposed via lib/galaxy/managers/configuration.py),
2. Celery is available, and
3. the tool exposes a typed parameter schema.

If any of these conditions are not met, submission falls back to the legacy /api/tools path via submitLegacy.

A Sentry info message is emitted only in the relevant case where tool requests and Celery are enabled but typed parameters are missing, allowing us to identify tools that still need schema support.

How to test the changes?

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.