Pre populate depositor name and date of deposit on dataset creation

[g-saracca]

What this PR does / why we need it:

Prepopulates deposit name and deposit date on dataset creation form.

Which issue(s) this PR closes:

• Closes Pre populate depositor name and date of deposit on dataset creation #510

Suggestions on how to test this:

Step 1: Run the Development Environment

1. Execute npm i.
2. Navigate with cd packages/design-system && npm run build.
3. Return with cd ../../.
4. Ensure you have a .env file similar to .env.example, with the variable VITE_DATAVERSE_BACKEND_URL=http://localhost:8000.
5. Navigate with cd dev-env.
6. Start the environment using ./run-env.sh unstable.
7. To verify the environment, visit http://localhost:8000 and check your local Dataverse installation.

Step 2: Test the feature

1. Go to the view to create a new dataset.
2. Depositor Name field should be pre-filled with user name and Deposit Date with the current date.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

No

Is there a release notes update needed for this change?:

No

Additional documentation:

N/A

[coveralls]

coverage: 97.518% (-0.9%) from 98.403%
when pulling 97ae0bd on 510/prefill-depositor-name-and-date
into 31c2d49 on develop.