Convert the MediaSource plugins to attributes

Closes #3420997

added 121 commits

• 0d794591...331141c7 - 120 commits from branch project:11.x
• 0acce799 - Merge branch drupal:11.x into 3420997-convert-mediasource-plugin

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• cf418cef - fix feedback

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• 02fd6fbe - fix feedback

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• 7e770f06 - fix feedback

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added 21 commits

• 7e770f06...4b9ffa3c - 20 commits from branch project:11.x
• d4097819 - Merge branch drupal:11.x into 3420997-convert-mediasource-plugin

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added 116 commits

• d4097819...b4a9a825 - 115 commits from branch project:11.x
• d87d9a99 - Merge branch drupal:11.x into 3420997-convert-mediasource-plugin

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added 1 commit

• f3d94a58 - fix feedback

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• 8d8b2ecd - fix feedback

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• 639de566 - fix feedback

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• 3045352c - fix feedback

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• 8227d5f9 - Apply 1 suggestion(s) to 1 file(s)

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