refactor(git): simplify parent branch detection alias

[dgokcin]

Summary

Simplifies the git parent alias by removing conditional logic and keeping only the essential command to detect the main parent branch (main/master/develop).

Changes

• Simplified parent git alias to directly return the first matching parent branch (main/master/develop)
• Removed conditional checks for current branch type
• Removed error message handling for cases when no parent branch is found

Additional Notes

• The simplified version always returns the first matching parent branch (main/master/develop)
• This change assumes that at least one of these branches exists in the repository
• The new implementation is more concise and performs fewer operations