[Hubs] Update the Build-OpenData.ps1 script to update file references

⚠️ Problem

The Build-OpenData.ps1 script generates OpenDataFunctions_resource_type_#.kql files, but doesn't update all references to these files, so there's a risk that all files won't be included in the build when new ones are added.

🛠️ Solution

Change the Build-OpenData.ps1 script to update the following files to include references to all generated OpenDataFunctions_resource_type_#.kql files:

• src/templates/finops-hub/.build.config
• src/templates/finops-hub/modules/dataExplorer.bicep

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