Support tolerations

[thomasschoeftner]

What changes were proposed in this pull request?

This PR adds the capability to define tolerations to cloudflow pods.

Why are the changes needed?

This change adds the bare minimum functionality to allow isolating workloads on specific K8S nodes/node pools. Ideally, this would be combined with affinities, but these are much more elaborate to configure. When putting different taints on every K8S node pool, tolerations alone are sufficient to assign Pods to a specific node pool.

This change was also recently requested in https://github.com/lightbend/cloudflow/issues/1207

Does this PR introduce any user-facing change?

More config options are available (documented in adoc file)

How was this patch tested?

Extra unit tests were added for

• CloudflowConfig
• AkkaRunner

[lightbend-cla-validator]

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