🐛 fix(VSecM Helm Charts): remove ability to not use SCM

[v0lkan]

Remove Option to Opt Out From SPIRE Controller Manager

Description

This PR removes the useClusterSpiffeIDs and useSpireControllerManager options from the helm charts.

SPIRE helm charts use SPIRE Controller Manager, and disabling it is nontrivial. Also, ClusterSPIFFEIDs are the best way to manage SPIFFEIDs in a Kubernetes cluster. — If we find a use case where these options are necessary, or if there is a need from the community, we can modify the code to let SPIRE install without SPIRE Controller Manager and bring those flags back.

Test Policy Compliance

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