Add release-zip job and workflow to 1.5 branch

[westonruter]

Summary

Cherry-picks commits from:

• Add release-zip job and workflow #4769
• Split dev and prod builds into two different jobs #4832
• Run build GHA workflow for all release branches #4834
• Update references to build script #4836

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

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[github-actions]

Plugin builds for d4901aa are ready 🛎️!

• Download development build
• Download production build

[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

ℹ️ Googlers: Go here for more info.

[googlebot]

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(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

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