Added tolerations support for dcgmexporter and neuronmonitor.

[musa-asad]

Description of changes:
In order to support tolerations for aws-observability/helm-charts#41, we need to update these files in the operator to add tolerations for dcgmexporter and neuronmonitor.

How I tested:

1. I placed these operator changes onto its own ECR repo.

• I already tested both the new ECR repo operator and helm chart changes for the above pull request.
• For this, I tested the both the (1) old CRDs + ECR repo operator changes and (2) new CRDs + old operator.

I observed that for (1), tainted nodes never ran any services as expected, but there were no errors. Before setting up (2), I ran into the following error:

W0521 01:12:26.400410    1435 warnings.go:70] unknown field "spec.tolerations"
W0521 01:12:26.444189    1435 warnings.go:70] unknown field "spec.tolerations"

However, it was resolved after updating CRDs with kubectl apply -f helm-charts/charts/amazon-cloudwatch-observability/crds in the updated helm-charts branch, which means there are no issues for both (1) and (2). Also, (2) didn't run changes for the dcgmexporter, which was expected since the change this PR intends to make isn't being applied:

NAME                                                              READY   STATUS    RESTARTS   AGE   IP               NODE                             NOMINATED NODE   READINESS GATES
amazon-cloudwatch-observability-controller-manager-677b54bszxsf   1/1     Running   0          57s   192.168.53.113   ip-192-168-33-152.ec2.internal   <none>           <none>
cloudwatch-agent-g7h96                                            1/1     Running   0          56s   192.168.54.143   ip-192-168-33-152.ec2.internal   <none>           <none>
fluent-bit-g4znc                                                  1/1     Running   0          57s   192.168.33.152   ip-192-168-33-152.ec2.internal   <none>           <none>

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[sky333999]

If someone is still using the old CRDs but run with the new operator after these changes, would it start to fail?
Perhaps run some tests to confirm the behavior in both cases.. old CRD with new operator and new CRD with old operator.