Add a nodeAffinity rule to the controller and webhook deployments

[aiden-deloryn]

Changes

This commit prevents controller and webhook pods from being
scheduled on Windows nodes. Without these affinity rules, the
controller or webhook will fail to deploy to a cluster if they
are scheduled on a Windows node by Kubernetes.

There is no need for these two components to run on Windows nodes
for Tekton to support mixed Linux + Windows clusters.

Related:
Issue - #1826
TEP - tektoncd/community#383

/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs included if any changes are user facing
• Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been filled in or deleted (only if no user facing changes)

Release Notes

Controller and Webhook pods will no longer be scheduled on Windows nodes if any exist in a Kubernetes cluster.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Aiden De Loryn (4947431)

[tekton-robot]

Hi @aiden-deloryn. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ghost]

/ok-to-test
/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbwsg

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[vdemeester]

/lgtm

[vdemeester]

/retest