I18nisation of search results broke file-based search result suppliers

To Reproduce:

1)

• Define a custom search result supplier and name it with a random name 'xyz.yaml'
• Do a search in the UI and see NPEs at info.magnolia.admincentral.findbar.SearchResultsGrid#getI18nizedSupplierLabel

2)

• Use external-dam module or e-commerce module
• Do a search in the UI and see NPEs at info.magnolia.admincentral.findbar.SearchResultsGrid#getI18nizedSupplierLabel

DEV Hints:

• The fix should be provided by iterating over the definitions and matching the correct one
• Trying to fetch with Registry#provider won't work because the id is the file name vs search result has a different type
  • Xyz vs 'product'
• Write unit tests