Include list of members with write permissions

[RachaelSTamakloe]

This PR adds the list of cluster toolkit users with write access to the Cluster Toolkit github repository. This list will be used to configure 2-Party Review on Github PRs from External Contributors in the workflow defined in PR3660. The workflow will require two members from this list to approve pull requests sent from an external contributor. We define an external contributor as someone who doesn't have write permissions to the Cluster toolkit Github repository.

Members of groups were generated by running the below command:

gh api   \
   -H "Accept: application/vnd.github+json" \
   -H "X-GitHub-Api-Version: 2022-11-28" \
   --paginate /orgs/GoogleCloudPlatform/teams/<TEAM_NAME>/members \
| jq '[.[] | {login}]'

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