CloudFunctions2Function support for spec.buildConfig.serviceAccount

[Silvest89]

Checklist

• I did not find a related open enhancement request.
• I understand that enhancement requests filed in the GitHub repository are by default low priority.
• If this request is time-sensitive, I have submitted a corresponding issue with GCP support.

Describe the feature or resource

apiVersion: cloudfunctions2.cnrm.cloud.google.com/v1alpha1
kind: CloudFunctions2Function

We usually use custom SA's for all our permission configurations. And would rather not fall back onto the default SA for cloud builds.
It would be nice for the CRD and ConfigConnector to support this field. Terraform Functions2 already supports.

Additional information

No response

Importance

This is both a nice to have and a pain point.
I would like support for this so we can follow best practices and create single-purpose service accounts and thus limit service account privileges