feat(cli): add --output-file flag to ado get

[AlessandroPomponio]

Summary

Adds support for writing ado get command output to a file using the new --output-file option. This enhancement allows users to save resource information directly to a file instead of stdout, improving automation and scripting capabilities.

Resolves #824

Files Changed

📄 orchestrator/cli/commands/get.py

Added a new --output-file command-line option to the get_resource command that accepts a file path for writing output. Includes validation logic to ensure the option is only used with file-based output formats (yaml, json, config) and raises an error if used with incompatible formats (default, name). The output file parameter is then passed to the resource handler.

📄 orchestrator/cli/models/parameters.py

Added output_file field (type: pathlib.Path | None) to the AdoGetCommandParameters model to support passing the output file path through the command execution pipeline.

📄 orchestrator/cli/utils/resources/handlers.py

Modified handle_ado_get_special_formats function to write formatted output to a file when output_file is specified in parameters. When a file is provided, the content is written to disk and a success message is displayed to stderr; otherwise, output is printed to stdout as before.