ci: Improve Danger and ci.yml explicitness (#31979)

Allow colons after issue links and for them to in ul.
Change ci references from [self-hosted, test] to more explicit
[self-hosted, macOS]

Release Notes:

- N/A

---------

Co-authored-by: Ben Kunkle <ben.kunkle@gmail.com>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

.github/workflows/ci.yml

@@ -73,7 +73,7 @@ jobs:
     timeout-minutes: 60
     runs-on:
       - self-hosted
-      - test
+      - macOS
     steps:
       - name: Checkout repo
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -200,7 +200,7 @@ jobs:
       needs.job_spec.outputs.run_tests == 'true'
     runs-on:
       - self-hosted
-      - test
+      - macOS
     steps:
       - name: Checkout repo
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4