Add a notice to explain why File widget settings might be unavailable

Closes #3037204
Proposed resolution from dww is not advisable as it would require a significant change to EntityDisplayFormBase. As a workaround, set #disabled instead of #access on the progress indicator field and add a message to explain the reason.

added 453 commits

• f74ebd3f...e7bb6157 - 452 commits from branch project:11.x
• f712cc26 - Merge branch drupal:11.x into 3037204-file-field-settings

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