Revert "[CI] Disable tests on nightly (#91489)"

This reverts commit 03fa32c.

Author: DilumAluthge

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
           # - '1.9' # TODO: uncomment this line once Julia 1.10.0 is released
           # - '~1.10.0-0' # TODO: uncomment this line once the first Julia 1.10.0 release candidate comes out. TODO: delete this line once Julia 1.10.0 is released
           - '1'
-          # - 'nightly'
+          - 'nightly'
         os:
           - ubuntu-latest
         arch: