fixes (user-signup): resolve issue with validation

[soulmini]

fixes (user-signup): resolve issue with validation

Fixes : #797

Description of Changes

In this pull request, I addressed the following changes to resolve issue #797:

• Added a new Toster to improve user signup validation.
• Updated the UserSignupForm component to handle edge cases in the validation process.
• Refactored the ValidationService for improved efficiency and readability.

Checklist:

• [Yes] My code adheres to the established style guidelines of this project.
• [Yes] I have conducted a self-review of my code.
• [Yes] I have included comments in areas that may be difficult to understand.
• [Yes] I have made corresponding updates to the project documentation.
• [Yes] My changes have not introduced any new warnings.

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