Issue #3377030: Add validation constraint to `type: label`: disallow multiple lines

added 2 commits

• fcb177c7 - Only run unit & kernel tests initially.
• e7dd7276 - Add validation logic for `type: label`.

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added 1 commit

• 59514f94 - Explicit test coverage for multiline labels.

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added 1 commit

• aaeff69a - A few config entity types either have no label or are computed dynamically.

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added 1 commit

• 7a18d764 - Run all tests again.

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added 2 commits

• 514c1c41 - Test multi-line `ContactForm` messages are considered valid.
• ae8bca8f - Test multi-line `FieldConfig` and `EntityFormDisplay` properties.

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added 1 commit

• b4285f7f - 2 config schema fixes: `type: text` instead of `type: label`.

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closed