fix(dropdown): Fix the dropdown closing on the second button click in…

[artemtrusov-cengage]

… Safari

Issue: #1142

What I did

Changes were made to the default behavior of the onMouseDown handler because it was causing the dropdown to "flash" instead of closing on the second click in Safari. Additionally, updates were made to the tests to properly simulate the blur event on the dropdown button.

Screenshots:

Checklist

• [x] changeset has been added
• [x] Pull request description is descriptive
• [ ] I have made corresponding changes to the documentation
• [x] New and existing unit tests pass locally with my changes
• [] I have added tests that prove my fix is effective or that my feature works

How to test

1. In Safari, go to the doc site.
2. Go to Dropdown.
3. Click on any Dropdown button to open a Dropdown, then click again to close.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9e0106408f0728a7e6099bbfc7f6745b3f4b4baf

The changes in this PR will be included in the next version bump.

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