Make the entity label field scannable, not just title [#3606272]

Problem/Motivation

The settings form only lets you scan configurable fields and one base field: title. But not every entity uses title for its label. Commerce product attribute values and media use name, so their label can never be searched or replaced.

Proposed resolution

Use the entity type's label key instead of the hardcoded title.

Remaining tasks

User interface changes

API changes

Data model changes

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3606272-scan-entity-label changes, plain diff MR !99
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