Use string representations of expressions in `CoalescerTest` and `ApiUiContentEntityReferenceControllersTest`
> **Follow-up of** [!1112](https://git.drupalcode.org/project/canvas/-/merge_requests/1112) — see [note 1200328](https://git.drupalcode.org/project/canvas/-/merge_requests/1112#note_1200328). ### Overview `CoalescerTest` and `ApiUiContentEntityReferenceControllersTest` express their expectations as `*PropExpression` object constructions. These are harder to scan than the equivalent string representations. A string representation is, post learning-curve, simpler for a human to read and preferable in test expectations. ### Proposed resolution Convert the expectation values in both tests from `*PropExpression` object instantiations to their string representations, improving readability of the test cases. ### Remaining tasks - Replace object-construction expectations with string representations in `CoalescerTest`. - Do the same in `ApiUiContentEntityReferenceControllersTest`.
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