Issue #3589499 by zeeshan_khan: Add kernel tests for x-entity-type-bundles and...

Zeeshann khaanrequested to merge
issue/3589499-x-entity-type-bundles-tests-and-docs into 1.0.x

Issue #3589499 by zeeshan_khan: Add kernel tests for x-entity-type-bundles and expand README examples

Add seven kernel tests covering single bundle, multiple bundles, invalid bundle fallback, omitted annotation, non-taxonomy entity types, array items, and schema-over-config precedence. Expand README annotation reference with array-type examples and the fallback behaviour note.

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