.NET: Fix snake_case argument names in Harness file tool descriptions

[Copilot]

Motivation & Context

AIFunctionFactory generates tool schemas from C# parameter names (camelCase), but several [Description] attributes on FileAccessProvider/FileMemoryProvider tools referred to those arguments using snake_case names. A model following the description would emit an argument name the schema doesn't recognize, so the value silently fails to bind and the tool runs without it (e.g., a missing filter) instead of surfacing an error.

Description & Review Guide

• What are the major changes?
  • Updated [Description] text on file_access_ls / file_memory_ls to say globPattern instead of glob_pattern.
  • Updated [Description] text on file_memory_grep to say globPattern instead of glob_pattern (the file_access_grep description already used "glob pattern" generically and needed no change).
  • Updated [Description] text on file_access_replace / file_memory_replace to say oldString, newString, replaceAll instead of old_string, new_string, replace_all.
  • Left replace_lines's line_number/new_line untouched — those parameters carry explicit [JsonPropertyName] attributes, so the schema genuinely uses snake_case there and the existing description is correct.
• What is the impact of these changes?
  • Description text only; no schema, parameter, or behavioral changes. Tool argument names exposed to models are unchanged — this just makes the description match what already exists.
• What do you want reviewers to focus on?
  • Confirm no other snake_case/camelCase mismatches remain across the two providers.

Related Issue

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

• Fixes .NET: [Bug]: Harness file tool descriptions name arguments in snake_case, but the generated schema is camelCase #7672

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