Add support for tolerations in helm chart

[k4r1]

What type of PR is this?
/kind enhancement

What does this PR do / why we need it:
Allows specifying tolerations in the helm chart.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

How to test changes / Special notes to the reviewer:

From helm/argocd-rbac-operator:

helm template -f values.test.yaml .

With e.g. values.test.yaml

tolerations:
- key: "key1"
  operator: "Equal"
  value: "value1"
  effect: "NoSchedule"

Observe in the rendered output that the tolerations are included in the spec.

[ggkhrmv]

Hi @k4r1 LGTM, thank you for the contribution :)