assistant_tools: Rename `RegexSearchTool` module to match the others (#27001)

This PR renames the `RegexSearchTool` module to `regex_search_tool.rs`
to match the other tools.

Release Notes:

- N/A

Marshall Bowers committed 1y ago

b70f21c08debeaa1960bf9a0f3760361e70a0c50

Parent: 5615be5

Committed by GitHub <noreply@github.com> on 3/18/2025, 4:20:15 PM