fix: correct UF2 artifact name for wio-tracker tags with hyphenated versions

##*- strips to the last hyphen, so wio-tracker-v1.15-plus.1.3 yielded
"plus.1.3" instead of "v1.15-plus.1.3". Switch to #*-v (shortest prefix
ending with -v) which preserves hyphens inside the version string.

Also remove the -Plus suffix appended in build_wio_tracker_l1_firmwares()
since the version scheme already encodes "plus" in the tag/version string,
making the suffix redundant and producing doubled output like "plus.1.3-Plus".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/actions/setup-build-environment/action.yml

@@ -22,8 +22,10 @@ runs:
         pip install --upgrade platformio
 
     # a git tag of "room-server-v1.2.3" should set "v1.2.3" as GIT_TAG_VERSION
+    # a git tag of "wio-tracker-v1.15-plus.1.3" should set "v1.15-plus.1.3" as GIT_TAG_VERSION
+    # Strip the shortest prefix ending with "-v" so hyphens in the version are preserved.
     - name: Extract Version from Git Tag
       shell: bash
       run: |
         GIT_TAG_NAME="${GITHUB_REF#refs/tags/}"
-        echo "GIT_TAG_VERSION=${GIT_TAG_NAME##*-}" >> $GITHUB_ENV
+        echo "GIT_TAG_VERSION=v${GIT_TAG_NAME#*-v}" >> $GITHUB_ENV