fix(issue-form): list published releases only, drop TestFlight draft entries

Per maintainer feedback (fredrikburmester, lancechant): the version dropdown
no longer surfaces draft releases as "X (TestFlight)" — drafts and prereleases
are unreliable version identifiers. update-issue-form.mjs now fetches only
published, non-prerelease releases and drops the per-version TestFlight label;
the workflow triggers on `released` events only; and the generic
"TestFlight/Development build" sentinel is restored at the end of the list.

.github/ISSUE_TEMPLATE/issue_report.yml

@@ -77,12 +77,13 @@ body:
       label: Streamyfin Version
       description: What version of Streamyfin are you running?
       options:
-        - 0.54.1 (TestFlight)
+        - 0.54.1
         - 0.51.0
         - 0.47.1
         - 0.30.2
         - 0.28.0
         - older
+        - TestFlight/Development build
     validations:
       required: true