test(alert): add annotations (#28414)

Issue number: N/A

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

I forgot to add annotations to tests to indicate the bug fix they are
validating: https://github.com/ionic-team/ionic-framework/pull/28408

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Added annotations

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->