Fix logic in tag-recreate-lts.yml for situation where tag is an RC

[swcurran]

The current logic is that there is a step that determines the tag for the release and another step that retrieves it. The first step skips setting the tag when it is an RC, and the latter step fails when no tag is set.

Help is needed to rationalize the handling when the tag is for an RC so that the GHA doesn't fail.

[swcurran]

Example failing run: https://github.com/openwallet-foundation/acapy/actions/runs/21269691110/job/61216966933