Deprecate MergeSpecification#segString method in MergePolicy
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Description
Following up from an old [TODO](https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/index/MergePolicy.java#L497), we can deprecate `MergePolicy.MergeSpecification#segString`. The places it's used (only 1?) doesn't need the `directory` param, and can simply use the `toString()` method.
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