refactor(system, data-frame): change term 'Metadata' to 'Properties'

[richie-ni]

🤨 Rationale

US : User Story 2861034: Update "Metadata" to "Properties" in the existing Grafana datasources - Systems and Dataframes

This Pull Request involves the change of updating the term 'MetaData' to 'Properties' as discussed in the Products & Results DataSource Requirements PR, in the Systems and DataFrame DataSource to improve clarity and consistency. This also involves renaming the SystemMetadata type to SystemProperties across various files in the asset DataSource.

👩‍💻 Implementation

• Renamed SystemMetadata to SystemProperties in the QuerySystemsResponse interface at src/core/types.ts
• Updated variable names and constants from metadata instead of properties in all relevant files
• Updated imports, function parameters, and test cases to use type SystemProperties instead of SystemMetadata in all relevant files.'.

🧪 Testing

• Test files have been updated with the term 'Properties' instead of 'MetaData' and verified manually that all tests are passing locally.

✅ Checklist

• This PR has a title that follows the commit message format.