[ServiceAccount] - Define and manage ServiceAccounts for platform workloads

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Create and maintain ServiceAccounts used by platform workloads.

Current scope:

• Define a base ServiceAccount for platform workloads
• Configure RBAC bindings for this ServiceAccount
• Ensure ServiceAccount is correctly applied in the target namespace

Future improvements:

• Create dedicated ServiceAccounts per workload

• Apply principle of least privilege

• Audit ServiceAccount usage across deployments

• Create ServiceAccount manifest

• Bind ServiceAccount to Role via RoleBinding

• Associate ServiceAccount with workloads

• Review permissions and reduce scope if needed