Description:
Open the attached PPTX file and save it as PPTX, the resulting file can't be opened in PowerPoint

OOXML validator gives the below error
```
{
    "Description": "The relationship 'rId4' referenced by attribute 'http://schemas.openxmlformats.org/officeDocument/2006/relationships:id' does not exist.",
    "Path": {
      "Namespaces": {},
      "XPath": "/dgm:dataModel[1]/dgm:ptLst[1]/dgm:pt[17]/dgm:t[1]/a:p[1]/a:r[2]/a:rPr[1]/a:hlinkClick[1]",
      "PartUri": "/ppt/diagrams/data1.xml"
    },
    "Id": "Sem_InvalidRelationshipId",
    "ErrorType": "Semantic"
  }
```

For SmartArts we are exporting the DOM as it is but we are not exporting the `.xml.rels` file. Only image relations are preserved in the roundtrip. Hyperlinks are not handled. This leads to XML having relationship IDs which are not present.

Steps to Reproduce:
1. Open the attached PPTX file
2. Save it in LO
3. Open the resulting file in PowerPoint

Actual Results:
PowerPoint fails to open the file

Expected Results:
PowerPoint opens the file without any problem


Reproducible: Always


User Profile Reset: Yes

Additional Info:
Version: 25.8.3.2 (X86_64)
Build ID: 8ca8d55c161d602844f5428fa4b58097424e324e
CPU threads: 22; OS: Linux 6.12; UI render: default; VCL: gtk3
Locale: en-IN (en_IN); UI: en-US
Calc: threaded