Fixed type assertion panic in network ID retrieval

[shurkys]

Refactored network ID retrieval logic to include checks for nil values and to ensure that the 'id' field is of type float64 before conversion. This prevents a panic caused by improper type assertion and ensures robust error handling in case of missing or invalid network IDs.

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Description

References

#000

New or Affected Resource(s)

• opennebula_XXXXX

Checklist

• [ ] I have created an issue and I have mentioned it in References
• [ ] My code follows the style guidelines of this project (use go fmt)
• [ ] My changes generate no new warnings or errors
• [ ] I have updated the unit tests and they pass succesfuly
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have updated the documentation (if needed)
• [ ] I have updated the changelog file