Add workaround for release publishing action mishandling draft: true -> false transition

[huonw]

This works around softprops/action-gh-release not being able to properly "publish" a release by changing draft: true to draft: false.

The intention is that the step with draft: false would find the existing draft release and update it (publishing it). This is what correctly happened for a testing v0.12.3-beta.3 release from this branch: https://github.com/pantsbuild/scie-pants/releases/tag/v0.12.3-beta.3 (I also did attempted a v0.12.3-beta.2 from this branch, but that used a newer version of the action code and failed completely, see below.)

Previously, the action would fail to find the existing draft release and instead create a duplicate one. The old behaviour is visible (to people who can see draft releases) with v0.12.3-beta.0 and -beta.1:

The particular new version of the action is:

• changes: softprops/action-gh-release@master...huonw:action-gh-release:huonw/pantsbuild-fix-see-scie-pants-439 (specifically commit huonw/action-gh-release@998f80d from branch https://github.com/huonw/action-gh-release/commits/huonw/pantsbuild-fix-see-scie-pants-439 )
• this is v2.0.9 (the current v2 tag) with fix: updating release draft status from true to false softprops/action-gh-release#316 merged in
• using v2.2.0 (the latest version of the action) fails while uploading artifacts with errors like Request body length does not match content-length header, so this sticks with the older version.

[benjyw]

Hopefully that PR gets upstreamed soon... Can we prompt them about it?

[huonw]

I've left a comment because it seemed like seeing real world usage was part of the review process, good call-out.