fix: Improve operator service probes and add authz header grpc initContainer #4841
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What this PR does / why we need it:
Fixes pod startup issues when Feast authorization is enabled.
Adds this header to grpcurl -
authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)
this PR also improves existing Deployment health probes and adds a startup probe
Which issue(s) this PR fixes:
Fixes #4848