otp-2236: adapt show department heads and make pi not deselectable

new: otp-2236: only show deputies to select and allow heads only with extra checkbox for project request

Closes otp-2347

Summary by CodeRabbit

• New Features

  • Implemented a new search functionality, allowing users to quickly find and display relevant results.
  • Introduced a dynamic event binding for cloned elements, enhancing interactivity and user experience.
  • Added a new function to fetch and display principal investigators (PIs) based on department selection.
  • Created new endpoints and methods to support department and PI related features.
  • Integrated a new user form for PI management in project requests.

• Enhancements

  • Extended event binding to handle additional roles in user forms.
  • Improved the user interface by refining styles and adding dynamic elements for a better user experience.

• Bug Fixes

  • Fixed test descriptions in end-to-end testing to accurately reflect the actions being tested.

• Documentation

  • Updated copyright notices and added documentation for new functions and methods.

• Refactor

  • Refactored event handling logic for better maintainability and performance.
  • Renamed and modified methods to improve clarity and align with new functionality.

• Style

  • Adjusted styles for a consistent and improved visual representation of the user interface.

• Tests

  • Modified and added test cases to ensure new features work as intended and existing functionality remains stable.

• Chores

  • Updated the database schema to support new project request features.