🔧 Fix repository checkout logic in workflow compiler

[dsyme]

Summary

• Simplified and standardized repository checkout logic in workflow compiler
• Always add checkout step unless it's already present in custom steps
• Extracted common action reference generation logic into a separate function

Key Changes

• Created getActionRef() function to centralize action reference generation
• Modified shouldAddCheckoutStep() to always add checkout by default
• Updated related tests to reflect new checkout behavior
• Removed complex conditional logic for checkout step determination

[pelikhan]

Dev contains "dirty" sometimes

[dsyme]

This is just factoring out code

[Copilot]

Pull request overview

This PR simplifies and standardizes the repository checkout logic in the workflow compiler and extracts common action reference generation logic into a reusable helper function.

Changes:

• Simplified checkout step logic to always add checkout unless it's already in custom steps (removed complex conditional logic based on action mode and agent files)
• Extracted common action reference generation pattern into getActionRef() helper function
• Updated all related tests to reflect the new simplified checkout behavior

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/workflow/compiler_jobs.go	Simplified shouldAddCheckoutStep() to always return true unless custom steps contain checkout, removed complex conditional logic for action modes and agent files
pkg/cli/copilot_setup.go	Added getActionRef() helper function and refactored four locations to use it instead of duplicating the action reference logic
pkg/workflow/compiler_jobs_test.go	Updated test expectation for release mode without agent file to expect checkout (changed from false to true)
pkg/workflow/compiler_yaml_main_job_test.go	Updated test name and expectation to reflect that checkout is required in release mode without agent file
pkg/workflow/engine_agent_import_test.go	Updated test name, comment, and expectation to reflect that checkout is always added without agent

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