Check Gitaly StatefulSet update status before rolling remaining workloads

Luke Addisonrequested to merge
18-check-gitaly-rollout-status into master

Uses the metadata.generation and status.observedGeneration fields to check whether Gitaly has been updated before rolling remaining workloads.

Closes #18 and #16

Depends on !12 (merged)

Edited by Luke Addison

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