Rebuild route in Search form base

Closes #3520385

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• f32b7033 - Rebuild route in Search form base

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• 95b9bb21 - Construct property promotion

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resolved all threads

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• 8cf35e37 - Functional test coverage to add search page of type content

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• 73956f14 - phpstan issue fix

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Changes here actually seem out of scope and un-related to the fix of the bug.

Can SearchConfigSettingsFormTest not be expanded or test added there.

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