Update version tests to use the new test framework

[Copilot]

This PR updates the func --version tests to use the new testing framework, as requested in issue #4337.

Changes Made

• Created a new FuncVersionCommand class in test/Cli/TestFramework/Commands/ directory that extends the base FuncCommand class to handle version-related command execution
• Updated the VersionTests class to use the new command-based testing approach instead of the older CliTester.Run method
• Renamed the test method from version to Version_DisplaysVersionNumber to better follow naming conventions
• Maintained the existing unit tests for IsRunningAnOlderVersion since they are focused on testing the internal version comparison logic rather than CLI commands

Implementation Details

The original test was running the CLI and checking for version output containing "4.". The new implementation:

1. Uses the FuncVersionCommand to execute the version command
2. Checks the command result's standard output for the expected version string
3. Verifies the exit code is 0 (indicating success)

The two unit tests that verify version comparison functionality (IsRunningAnOlderVersion_ShouldReturnTrue_WhenVersionIsOlder and IsRunningAnOlderVersion_ShouldReturnFalse_WhenVersionIsUpToDate) were kept as-is since they're not testing CLI functionality directly.

Fixes #4337.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• azfunc.pkgs.visualstudio.com
  • Triggering command: dotnet build test/Azure.Functions.Cli.Tests/Azure.Functions.Cli.Tests.csproj (dns block)
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
  • Triggering command: dotnet build test/Cli/TestFramework/Azure.Functions.Cli.TestFramework.csproj (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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