[🚀 Feature]: Add Node Affinity to Helm chart Selenium

[yasha-dev1]

Feature and motivation

There is a need to create Affinity for all the nodes which are deployed in selenium helm chart. currently there is no Affinity in default values of the helm chart. It would be a really good feature to add that. a Common pattern is to add it to global.affinity. there are some helm charts which already do that already

Usage example

global:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
          - matchExpressions:
              - key: lke.linode.com/pool-id
                operator: In
                values:
                  - "<POOL_ID>"

[github-actions]

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