Duplicated attribution content
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Description
### What happened?
Credits from Google2DImageryProvider are duplicated at some zoom levels. May have been introduced in this commit https://github.com/CesiumGS/cesium/pull/12913/commits/2df3d249d58c4050ae6a0ba54e24d36ff24cbef9
### Reproduction steps
1. Load sandcastle with imagery layer using per-tile/viewport dynamic attribution, eg. [sandcastle](https://sandcastle.cesium.com/#c=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) loads Google Maps Satellite using the Google2DImageryProvider
2. Note duplicate content
3.
...
### Sandcastle example
_No response_
### Environment
Browser:
CesiumJS Version:
Operating System:
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Assessment
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