Include PM Team in membership check

[t-will-gillis]

Fixes #8515

What changes did you make?

• Added website-pm to memberOfAdminOrMergeTeam in github-actions/trigger-issue/add-preliminary-update/preliminary-update-comment.js

Why did you make the changes (we will use this info to test)?

• Website PMs should be automatically excluded from the complexity eligibility checks

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Screenshots of Proposed Changes To The Website (if any, please do not include screenshots of code changes)

• no visual change

[github-actions]

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From your project repository, check out a new branch and test the changes.

git checkout -b t-will-gillis-add-website-pms-8515 gh-pages
git pull https://github.com/t-will-gillis/website.git add-website-pms-8515

[t-will-gillis]

Merging immediately so that PM can continue