Feature/remove get available tags

[Shashankss1205]

Reference Issues/PRs

See also: feature/data_management

What does this implement/fix? Explain your changes.

This PR cleans up legacy, unused docstring comments referencing the get_available_tags tool in list_estimators.py.
The get_available_tags tool was previously unified and integrated into the query_registry tool under target="tags". Removing these legacy docstrings prevents developer and LLM confusion when interacting with the discovery tool catalog.

Does your contribution introduce a new dependency? If yes, which one?

No, this contribution does not introduce any new dependencies.

What should a reviewer concentrate their feedback on?

• Verify that all unit tests (make check) continue to pass.
• Verify that query_registry(target="tags") remains the unified interface for tag queries.

Any other comments?

N/A

PR checklist

For all contributions

• I've added unit tests and made sure they pass locally (make check).
• I've added the tool to the online documentation in docs/source/.
• I've updated the existing example scripts or provided a new one to showcase how my tool works in examples/.

[Shashankss1205]

Stale