feat: display profile name in navbar if available

[ArturGaspar]

Description

Display profile name instead of username in header if available.

Port of #2.

Supporting information

#2

Testing instructions

1. Install this component (npm install @edx/frontend-component-header@npm:@opencraft/frontend-component-header@~5.3.4-test; for Tutor, see https://github.com/overhangio/tutor-mfe/blob/master/README.rst#customising-mfes).
2. Set a user's name (in the Django admin that is the name in the UserProfile, not the first and last name fields).
   
3. Log out and log in again
4. Check that the user's name now appears in the Course Authoring header
   
5. Check that the user's name now appears in the Learning header when viewing a course
   

Deadline

2024-10-15

Other information

Internal-ref: https://tasks.opencraft.com/browse/BB-9022

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[tecoholic]

@ArturGaspar 👍

• I tested this: Installed the header locally using Tutor and verified that the name is shown in Course Authoring and Learning MFE
• I read through the code
• I checked for accessibility issues
• Includes documentation