Add branch name to TestRail run (#3980)

This adds the branch name to the buildup of the TestRail run name.

Before this.. all test results looked the same.

### QA Notes

Verified in TestRail vs a full smoke run

https://posit.testrail.io/index.php?/runs/view/2900&group_by=cases:section_id&group_order=asc

Author: jonvanausdeln

.github/workflows/positron-full-test.yml

@@ -126,7 +126,7 @@ jobs:
       - name: Set TestRail Run Title
         id: set-testrail-run-title
         if: always()
-        run: echo "TESTRAIL_TITLE=$(date +'%Y-%m-%d') Smoke Tests" >> $GITHUB_ENV
+        run: echo "TESTRAIL_TITLE=$(date +'%Y-%m-%d') Smoke Tests - $GITHUB_REF_NAME" >> $GITHUB_ENV
 
       - name: Upload Test Results to TestRail
         id: testrail-upload