Resolve #3401837 "Validate config schema definitions"

Closes #3401837

added 2 commits

• ecdfa82d - Validate `type`.
• 63ca9fd6 - PoC for validating absence of circular type references in config schema.

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added 1 commit

• 70150ead - Fix `filter_settings.filter_html` definition.

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added 76 commits

• 70150ead...67dbfb98 - 73 commits from branch project:11.x
• a85be97f - Validate `type`.
• 9a5e0ec7 - PoC for validating absence of circular type references in config schema.
• 3a13018e - Fix `filter_settings.filter_html` definition.

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added 360 commits

• 3a13018e...d8c4e4cf - 356 commits from branch project:11.x
• ecdfa82d - Validate `type`.
• 63ca9fd6 - PoC for validating absence of circular type references in config schema.
• 70150ead - Fix `filter_settings.filter_html` definition.
• f0ecf624 - Merge remote-tracking branch 'origin/11.x' into 3401837-validate-config-schema-definitions

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added 1 commit

• d6b89935 - `phpcs`

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added 3 commits

• b95f3449 - Clean up handling of `type: undefined` and `type: ignore`.
• efa0011d - Clean up `::getShape()`.
• 486f4813 - @phenaproxima review: Fix nits in `::getIndirectlyReferencedTypes()`.

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added 1 commit

• 63069818 - Remove `Mapping::getPossibleTyped()` because that exact logic is now available...

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