[task] Consolidate duplicate config parsing functions in config.go

[github-actions]

Objective

Create a generic helper function to eliminate near-duplicate config parsing functions in pkg/workflow/config.go.

Context

The analysis identified that parseTitlePrefixFromConfig and parseTargetRepoFromConfig have ~90% code similarity, differing only in the key name, variable names, and log message text. This is Issue #1 from the semantic function clustering analysis (Priority 1: High Impact, Low Effort).

Related to #3478

Approach

1. Create a new generic helper function parseStringFromConfig(configMap map[string]any, key string) string
2. Implement the common pattern: check existence, type assertion, logging
3. Refactor parseTitlePrefixFromConfig to use the helper
4. Refactor parseTargetRepoFromConfig to use the helper
5. Ensure all existing tests continue to pass

Files to Modify

• pkg/workflow/config.go - Add generic helper and refactor existing functions
• pkg/workflow/config_test.go - Add tests for the new helper function (if file exists, or create it)

Acceptance Criteria

• Generic parseStringFromConfig helper function created
• parseTitlePrefixFromConfig refactored to use the helper
• parseTargetRepoFromConfig refactored to use the helper
• All existing tests pass
• New tests cover the generic helper function
• Code duplication reduced from ~90% to minimal
• Logging behavior preserved

Estimated Effort

30 minutes

Benefits

• Reduces code duplication
• Single source of truth for string config parsing
• Easier to add new config fields in the future
• Improved maintainability
  Related to [refactor] 🔧 Semantic Function Clustering Analysis - Refactoring Opportunities #3478

AI generated by Plan Command for #3478