Allow Updates to `template` Attribute in `opennebula_service_template` Resource Without Forcing New Resource

[shurkys]

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Description

This pull request modifies the opennebula_service_template resource to allow updates to the template attribute without forcing the resource to be recreated. The following changes were made:

• Set ForceNew to false for the template attribute.
• Added logic to handle updates to the template attribute in the resourceOpennebulaServiceTemplateUpdate function.

These changes enable updating the template attribute and applying changes without recreating the entire resource.

New or Affected Resource(s)

• opennebula_service_template

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 successfully
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have updated the documentation (if needed)
• [ ] I have updated the changelog file

[github-actions[bot]]

This pull request is stale because it has been open for 30 days with no activity and it is not in a milestone. Remove 'status: stale' label or comment, or this will be closed in 5 days.