Issue/3420983: Convert Layout plugin discovery to attributes.

Closes #3420983

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• 60fc957d - Apply 6 suggestion(s) to 2 file(s)

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• 60fc957d...331141c7 - 79 commits from branch project:11.x
• 5faf0b76 - Merge branch drupal:11.x into 3420983-convert-layout-plugin

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• 5faf0b76...9f6b172c - 90 commits from branch project:11.x
• 04f3c7db - Merge branch drupal:11.x into 3420983-convert-layout-plugin

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• 2a280b6a - add deriver and made some params optional

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• 2a280b6a...db132d85 - 8 commits from branch project:11.x
• d9e533eb - Merge branch drupal:11.x into 3420983-convert-layout-plugin

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• d9e533eb...e84fc608 - 110 commits from branch project:11.x
• 32961b3f - Merge branch drupal:11.x into 3420983-convert-layout-plugin

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added 67 commits

• 32961b3f...4df46ba4 - 63 commits from branch project:11.x
• 309d330f - Issue/3420983: Convert Layout plugin discovery to attributes.
• 0313a4c0 - Apply 6 suggestion(s) to 2 file(s)
• f2abb1a4 - add deriver and made some params optional
• 6a7f5e6a - Some phpstan fixes

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• b519acca - attempt to fix phpstan errors

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added 13 commits

• b519acca...434e19e0 - 7 commits from branch project:11.x
• 78fac836 - Issue/3420983: Convert Layout plugin discovery to attributes.
• e819e817 - Apply 6 suggestion(s) to 2 file(s)
• 989544f5 - add deriver and made some params optional
• 57946a23 - Some phpstan fixes
• 8c6df68a - attempt to fix phpstan errors
• afd2914c - Add use statements to LayoutPluginManagerTest

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added 14 commits

• afd2914c...1916b786 - 13 commits from branch project:11.x
• 5d059ad1 - Merge branch drupal:11.x into 3420983-convert-layout-plugin

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• f171cfee - Update missing test_layout_main_and_footer layout

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• 1a8735ac - Update missing test_layout_main_and_footer layout

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• 5ea9df46 - Update missing test_layout_main_and_footer layout

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