Product Docs Request: Extend GitHub Actions

[mattermod]

Summary: Reduce product docs PR review toil

When a product documentation PR impacts 10 or fewer pages of the docs system, update the GitHub action that comments on product docs PRs to:

• Comment in the product docs PR with links to a generated preview for each impacted page.
• Continue commenting with links for each PR commit.

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JIRA: https://mattermost.atlassian.net/browse/MM-55997

[shaon72]

@amyblais Hi can I take up this issue?

[ritfiz]

Hi @mattermod just to confirm, shouldn't this issue be added in https://github.com/mattermost/docs/issues

[shaon72]

@amyblais This is supposed to be an issue in docs repo.