support `storage-credentials` in other IRC responses

we added `storage-credentials` parsing for `LoadTableResult` in #3042

Lets do the same for 
- [LoadCredentialsResponse](https://github.com/apache/iceberg/blob/652691c2ab06176f16f1db418d87d70cd94b176a/open-api/rest-catalog-open-api.yaml#L3449)
- [CompletedPlanningResult](https://github.com/apache/iceberg/blob/652691c2ab06176f16f1db418d87d70cd94b176a/open-api/rest-catalog-open-api.yaml#L3554)


We could test w/ Polaris

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support `storage-credentials` in other IRC responses #3165

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support storage-credentials in other IRC responses #3165

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support `storage-credentials` in other IRC responses #3165