refactor: restructure CouponsPage class and enhance coupon management…

[shohan0120]

… tests

• Refactored CouponsPage class to improve structure and readability.
• Added new methods for navigating and managing coupons, including creating, searching, and verifying coupons.
• Updated e2e tests to utilize the refactored CouponsPage class, ensuring better organization and clarity in test cases for admin, vendor, and customer coupon functionalities.

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• My code follow the WordPress' coding standards
• My code satisfies feature requirements
• My code is tested
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Changes proposed in this Pull Request:

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Title

Detailed Description of the pull request. What was previous behaviour
and what will be changed in this PR.

Before Changes

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After Changes

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PR Self Review Checklist:

• Code is not following code style guidelines
• Bad naming: make sure you would understand your code if you read it a few months from now.
• KISS: Keep it simple, Sweetie (not stupid!).
• DRY: Don't Repeat Yourself.
• Code that is not readable: too many nested 'if's are a bad sign.
• Performance issues
• Complicated constructions that need refactoring or comments: code should almost always be self-explanatory.
• Grammar errors.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch couponsE2E/refacotr-fix

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