helm: update agent version to v0.37.1 (grafana#5431)

Signed-off-by: Paschalis Tsilias <[email protected]>

release v0.36.2

Release Agent Helm chart v0.25.0 (grafana#5279)

Update Grafana Agent version to v0.36.2

operations/helm: change StatefulSets to deploy in Parallel (grafana#5129

)

Now that Flow mode cluster nodes will rejoin the cluster in the
background, we can speed up the default rollout by changing StatefulSets
to deploy in Parallel.