* Replace UpdateAttestationConfig with ApplyJoinConfig
* Dont set up join-config over Helm, it is now only managed by our CLI directly during init and upgrade
* Remove measurementSalt and attestationConfig parsing from helm, they were only needed for the JoinConfig
* Add migration step to remove join-config from Helm management
* Update attestation config trouble shooting tip
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Signed-off-by: Daniel Weiße <dw@edgeless.systems>