fix: Inconsistent Handling of Patient Name Tag

[Jaseel-trenser]

Context

• The viewer exhibits inconsistent behavior when processing patient name tag provided in a string format. It expects the tag to be formatted as PatientName.Alphabetic.This MR is to supports and processes patient name tags, regardless of whether they are provided in string format or as PatientName.Alphabetic.
• This PR has been incorporated by FlyWheel.io.
• Close Issue with Handling Patient Name Tag in String Format #4702

Changes & Results

• By this change, it supports and processes patient name tags, regardless of whether they are provided in string format or as PatientName.Alphabetic
• Also done some code optimization by removing duplicate functions formatPN

Testing

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• OS: Windows
• Node version: 18
• Browser: Chrome

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