Add tolerations for delete hook script

[aLekSer]

Tolerations for delete Agones resources same as for the controller.

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup
/kind documentation
/kind feature

/kind hotfix

What this PR does / Why we need it:
Currently Job for deleting resources created on default node pool. If we add taints to all nodes in default node pool, than this Job could not be scheduled.
https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/

Which issue(s) this PR fixes:

Closes #1504

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: d5c9b492-881e-4fdb-bb40-22ef067a7d89

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.6.0-3a29023
• image: gcr.io/agones-images/agones-sdk:1.6.0-3a29023
• image: gcr.io/agones-images/agones-ping:1.6.0-3a29023
• Linux C++ SDK (build): agonessdk-1.6.0-3a29023-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.6.0-3a29023.zip

A preview of the website (the last 30 builds are retained):

• https://3a29023-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1521/head:pr_1521 && git checkout pr_1521
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.6.0-3a29023

[markmandel]

I like this approach. It's the easiest implementation. If people need to have their own custom toleration, we could provide an extra configuration for delete_job toleration, and then default to the controller toleration 👍

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aLekSer, markmandel

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Needs approval from an approver in each of these files:

• OWNERS [markmandel]

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 79c5886e-cfb0-4a49-b9b2-1c96597e6ac0

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.6.0-29ea344
• image: gcr.io/agones-images/agones-sdk:1.6.0-29ea344
• image: gcr.io/agones-images/agones-ping:1.6.0-29ea344
• Linux C++ SDK (build): agonessdk-1.6.0-29ea344-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.6.0-29ea344.zip

A preview of the website (the last 30 builds are retained):

• https://29ea344-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1521/head:pr_1521 && git checkout pr_1521
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.6.0-29ea344