Add `refs/tags/` prefix to selected tag

### What feature do you want to see added?

I'm using this plugin to feed the a select value directly to the "Branches to build"-Attribute (of the Git plugin) in a pipeline job:

This is working fine when selecting branches (PT_BRANCH or PT_BRANCH_TAG) but not when selecting a tag (e.g. PT_BRANCH_TAG) because this plugin will only return the simple tag name without the `refs/tags/` prefix, which is needed by git-plugin (see highlighted section in the help text).

It would therefore be really helpful if I could tell the plugin something like "Always add `refs/tags/` prefix to tag values" or something line that.

### Upstream changes

_No response_

### Are you interested in contributing this feature?

Possibly, with some guidance.