Support includeIgnoredFiles option in search results

[bryanchen-d]

Fixes microsoft/vscode#270857

Introduce a new option to include files that are normally ignored according to .gitignore and other exclusion settings in search results.

[Copilot]

Pull Request Overview

This PR adds support for including ignored files in the findTextInFiles tool by introducing a new optional includeIgnoredFiles parameter.

• Adds includeIgnoredFiles boolean parameter to control whether files that are normally ignored (by .gitignore, ignore files, and VS Code exclude settings) should be included in search results
• Updates the search implementation to properly configure useExcludeSettings and useIgnoreFiles options based on this parameter
• Exposes the parameter through the tool's JSON schema for AI model consumption

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/extension/tools/node/findTextInFilesTool.tsx	Adds includeIgnoredFiles parameter to the tool interface and implements logic to disable exclusion settings and ignore files when the parameter is true
package.json	Updates the tool schema to expose the new includeIgnoredFiles parameter with appropriate description