Add option to customize Thanos deployment strategies

[keithhand]

What does this PR change?

It gives users the ability to customize the Thanos deployment strategies via custom values.yaml options.

How does this PR impact users? (This is the kind of thing that goes in release notes!)

Added option to customize Thanos deployment strategies.

Links to Issues or ZD tickets this PR addresses or fixes

• Closes Allow users to customize Thanos deployment strategy types #1328

How was this PR tested?

First, I used a GKE cluster with Thanos installed where I was receiving the "Multi-Attach error for volume" error. I confirmed the upgrade could not process and checked the status of the deployment strategies with the following command:

❯ kubectl get deploy -l="app.kubernetes.io/name=thanos" -ojsonpath='{.items[*].spec.strategy.type}'
RollingUpdate RollingUpdate RollingUpdate RollingUpdate RollingUpdate

I then upgraded the cluster with the values:

thanos:
  store:
    deploymentStrategy: 
      type: Recreate
  query:
    deploymentStrategy: 
      type: Recreate
  query-frontend:
    deploymentStrategy: 
      type: Recreate
  compact:
    deploymentStrategy: 
      type: Recreate
  bucket:
    deploymentStrategy: 
      type: Recreate

I tested the same command before to confirm the deployment strategy, and I confirmed that the upgrade was now working.

❯ kubectl get deploy -l="app.kubernetes.io/name=thanos" -ojsonpath='{.items[*].spec.strategy.type}'
Recreate Recreate Recreate Recreate Recreate

Have you made an update to documentation?

Added value description in charts/thanos/values.yaml