Fix github workflow such that it better accomodates PRs from forks th…

[BellringerQuinn]

…at won't have access to the project access tokens. Also, store the pr body in an .env so that it can't potentially be used for an injection attack, see https://docs.github.com/en/actions/security-for-github-actions/security-guides/security-hardening-for-github-actions\#example-of-a-script-injection-attack

Version Increment

Please ensure you have incremented the package version in the package.json as necessary.

• I have incremented the package.json according to semantic versioning
• No version increment is needed; the change does not impact SDK or Sample code/assets

Docs Checklist

Please ensure you have addressed documentation updates if needed as part of this PR:

• I have created a separate PR on the sequence docs repository for documentation updates: Link to docs PR
• No documentation update is needed for this change.