Run UI tests on PRs with "ui" label (#20209)

* add conditional for label

* VAULT-14643 link jira

.github/workflows/ci.yml

@@ -183,12 +183,14 @@ jobs:
     # The test-ui job is only run on:
     # - pushes to main and branches starting with "release/"
     # - PRs where the branch starts with "ui/", "backport/ui/", "merge", or when base branch starts with "release/"
+    # - PRs with the "ui" label on github
     if: |
       github.ref_name == 'main' ||
       startsWith(github.ref_name, 'release/') ||
       startsWith(github.head_ref, 'ui/') ||
       startsWith(github.head_ref, 'backport/ui/') ||
-      startsWith(github.head_ref, 'merge')
+      startsWith(github.head_ref, 'merge') || 
+      contains(github.event.pull_request.labels.*.name, 'ui')
     needs:
     - setup
     permissions:

.github/workflows/milestone-checker.yml

@@ -14,7 +14,7 @@ on:
 jobs:
   # checks that a milestone entry is present for a PR
   milestone-check:
-    # If there  a `pr/no-milestone` label we ignore this check
+    # If there is a `pr/no-milestone` label we ignore this check
     if: "!contains(github.event.pull_request.labels.*.name, 'pr/no-milestone')"
     runs-on: ubuntu-latest
     steps: