fix(mr checkout): respect git_protocol configuration instead of hardcoding SSH

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Description

The glab mr checkout command was hardcoded to use SSH URLs via mrProject.SSHURLToRepo regardless of the user's git_protocol configuration setting. This caused issues for users who preferred HTTPS protocol or worked in environments where SSH was not available.

Changes:

• Replace hardcoded mrProject.SSHURLToRepo with protocol-aware URL selection
• Add configuration reading to respect the user's git_protocol preference
• Use glrepo.RemoteURL() to select appropriate URL (SSH/HTTPS) based on config
• Apply protocol selection for git operations

• fix(mr checkout): respect git_protocol configuration instead of hardcoding SSH

Related Issues

Resolves #7947

How has this been tested?

Tested for mr checkout by creating a build locally, also added tests for

• Add runCommandWithConfig() helper to support configuration testing
• Add test case for HTTPS protocol configuration
• Verify that HTTPS URLs are used when git_protocol is set to "https"

Screenshots (if appropriate):

Before and After, for after I've used the locally build CLI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)
• Test gap

Closes #7947 (closed)