Fix | 2022.4 | Server/Gateway: pre-existing service account name is ignored by Gateway chart in custom namespaces

[andreazorzetto]

This change fixes an issue that causes the wrong service account to be assigned to the gateway under these circumstances:

• server chart is used to deploy server and gateway
• charts are installed into custom namespace
• serviceAccount.create=false and gateway.serviceAccount.create=false

The specific issue with the current chart is that the gatway will not receive the service account name and in the deployment manifest will assign "namespace-sa" service account to the gateway. This results in a gateway pod not starting

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