[JS] Fix: making methods static

[TamsilAmani]

Description

This change is made (in JS) to be in line with the corresponding Java binding of Virtual Authenticator.

Motivation and Context

Please refer to methods

public static Credential createResidentCredential()
public static Credential createNonResidentCredential()

in https://github.com/SeleniumHQ/selenium/blob/trunk/java/src/org/openqa/selenium/virtualauthenticator/Credential.java

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.

[TamsilAmani]

After discussing with @pujagani and concluding that the initial changes were "breaking" in nature, I modified my code.

1. This is NOT a breaking change now.
2. Added static methods (with the same names as non-static ones) and kept the non-static methods as they are, but deprecated them.

Now the functions can be called either directly by class name or with class object. In future, we plan to delete the non-static ones after 3 releases (reason given in description).

[pujagani]

Thank you @TamsilAmani !

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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