[CDE] ApiDocument Watermark tests

Add tests for 
[GetWatermarkSettings](https://api.onlyoffice.com/docs/office-api/usage-api/text-document-api/apidocument/getwatermarksettings/)
[InsertWatermark](https://api.onlyoffice.com/docs/office-api/usage-api/text-document-api/apidocument/insertwatermark/)
[RemoveWatermark](https://api.onlyoffice.com/docs/office-api/usage-api/text-document-api/apidocument/removewatermark/)
[SetWatermarkSettings](https://api.onlyoffice.com/docs/office-api/usage-api/text-document-api/apidocument/setwatermarksettings/)

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[CDE] ApiDocument Watermark tests #1256

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[CDE] ApiDocument Watermark tests #1256

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