All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Adds the product title to the header when available, otherwise adds a "add new" string to the header based on product type.

Note that product types haven't been officially added yet, so a simple product type placeholder exists.

Closes #35172 .

• This PR is a very minor change/addition and does not require testing instructions (if checked you can ignore/remove the next section).

How to test the changes in this Pull Request:

1. Navigate to the new product management experience ( Products -> Add new (MVP) ).
2. Note that "New product" exists in the header initially
3. Type something in the product name field
4. Note that the header is updated to reflect this name
5. Delete the content from the product name field
6. Note that the header reverts to "New product"
7. Save the product as a draft or publish
8. Remove the content from the product name field
9. Note that the previously saved name shows in the header
10. Type some content in the product name field
11. Note that the header is updated to reflect those changes

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you created a changelog file for each project being changed, ie pnpm --filter=<project> changelog add?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.