Allow skipping project fallback with file-based run

[jjonescz]

Resolves #49790.

[Copilot]

Pull Request Overview

This PR introduces a --file option to the dotnet run command, allowing users to explicitly specify a file-based app to run and skip project fallback behavior. This addresses GitHub issue #49790 by providing a way to run file-based apps even when a project exists in the current directory.

Key changes include:

• Added new --file option to the run command with appropriate validation
• Updated file-based app execution logic to use the new option format internally
• Added comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/Cli/dotnet/Commands/Run/RunCommandParser.cs	Adds the new --file option definition
src/Cli/dotnet/Commands/Run/RunCommand.cs	Implements logic for handling the --file option and validation
src/Cli/dotnet/Program.cs	Updates file-based app parsing to use --file option format
src/Cli/dotnet/Commands/CliCommandStrings.resx	Adds localization strings for the new option
test/dotnet.Tests/CommandTests/Run/RunFileTests.cs	Adds test coverage for the new functionality
documentation/general/dotnet-run-file.md	Updates documentation to reflect the new option
Multiple .xlf files	Adds localization entries for all supported languages
Multiple completion snapshot files	Updates shell completion scripts

[jjonescz]

@RikkiGibson @jaredpar for reviews, thanks

[jjonescz]

@RikkiGibson @333fred for reviews, thanks