[java] Refactored the UsernameAndPassword class to a record

[manuelsblanco]

User description

Refactored the UsernameAndPassword class to a record, simplifying the implementation and ensuring immutability. Removed the redundant of method and Supplier<Credentials> usage, as they are no longer needed with the record structure.

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Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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PR Type

Enhancement

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Description

• Refactored UsernameAndPassword class into a Java record.

• Simplified implementation by removing redundant methods.

• Ensured immutability and streamlined the code structure.

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Changes walkthrough 📝

	Relevant files
Enhancement	UsernameAndPassword.java Refactored `UsernameAndPassword` class to a `record`          java/src/org/openqa/selenium/UsernameAndPassword.java Converted UsernameAndPassword class to a Java record. Removed the of method and Supplier usage. Eliminated redundant getter methods for username and password. Simplified constructor with Require.nonNull checks. +1/-22

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[VietND96]

@manuelsblanco Can you resolve the conflict?