chore(ci): fix stencil nightly job dependencies (#27298)

Issue number: N/A

---------

<!-- Please refer to our contributing documentation for any questions on
submitting a pull request, or let us know here if you need any help:
https://ionicframework.com/docs/building/contributing -->

<!-- Some docs updates need to be made in the `ionic-docs` repo, in a
separate PR. See
https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#modifying-documentation
for details. -->

<!-- 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. -->

The Stencil nightly job fails with the following error:

```
The workflow is not valid. .github/workflows/stencil-nightly.yml (Line: 101, Col: 13): Job 'test-core-screenshot-legacy' depends on unknown job 'build-core'. 

.github/workflows/stencil-nightly.yml (Line: 122, Col: 12): Job 'verify-screenshots-legacy' depends on job 'test-core-screenshot-legacy' which creates a cycle in the dependency graph.
```

This started to fail last night. I believe this is a result of
https://github.com/ionic-team/ionic-framework/pull/27228, specifically
this line
https://github.com/ionic-team/ionic-framework/commit/4fe8de7df71b0d9fb8d618aca5a428129d96a04b#diff-2f087e8fac034d51c50fc9350e10ceb4034298c16dd0d4f414f79d88ebb71aa0R101

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

this commit updates the job dependency hierarchy for
test-core-screenshot-legacy from `build-core` to
`build-core-with-stencil-nightly`. the former is not a valid job name
for the `stencil-nightly` workflow, likely just a copy/paste error

## 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

To test this, I was able to kick off a version of this job with this
branch:
https://github.com/ionic-team/ionic-framework/actions/runs/4819613134
and saw the new/legacy screenshot tests running:
![Screenshot 2023-04-27 at 8 29 14
AM](https://user-images.githubusercontent.com/1930213/234862292-61896fa2-f5be-4c96-bfe3-2f2198315763.png)


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