test(toolbar): migrate to generators (#27389)

Issue number: N/A

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## What is the current behavior?
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Toolbar tests are using legacy syntax

## What is the new behavior?
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- Toolbar tests are using generator syntax


https://github.com/ionic-team/ionic-framework/pull/27389/commits/7ca8c57ed30b514aa6b6216bc1e511bbf664eeec

- The color behavior tests do not vary across directions, so I removed
the extra RTL 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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