fix: convert imageRepository to string type

[TeddyCr]

Describe your changes:

Fixes #14899

• container image may not necessarily be a URL (see Sagemaker Model metadata ingestion fails if container URI is missing URL scheme #14899). If not it will fail Pydantic URL validation -- hence converting to plain string

Type of change:

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• I have read the CONTRIBUTING document.
• My PR title is Fixes <issue-number>: <short explanation>
• I have commented on my code, particularly in hard-to-understand areas.
• For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[sonarcloud]

Quality Gate passed for 'open-metadata-ingestion'

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud