Refactor: Auth setup and Test Structure Improvements

[kneerose]

List of changes

• Refactored authentication logic into modular setup files:
  • dRep.auth.setup.ts for dRep authentication
  • proposal-discussion.auth.setup.ts for proposal discussion
  • budget-discussion.auth.setup.ts for budget discussion
  • adaholder.auth.setup.ts and user.auth.setup.ts for Adaholder and User authentication respectively
• Updated Playwright project structure to load only relevant auth setup files based on test context
• Replaced hardcoded authentication values with a centralized auth constants file
• Moved dRep registration tests from misc to a dRepRegistration directory
• Added DEV_URL support for manual workflow dispatch
• Remove unnecessary skipIfHardFork function and its uses

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

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