test(utils): migrate to generators (#27383)

Issue number: N/A

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## What is the current behavior?
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Animation, framework delegate, and overlay tests are using legacy syntax

## What is the new behavior?
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this PR. -->

- Animation, framework delegate, and overlay tests are using generator
syntax


https://github.com/ionic-team/ionic-framework/pull/27383/commits/513e8508422460ca435b487dc541be269f86192d

The overlay focus tests do not vary across modes, so I removed the extra
checks.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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