fix: macOS tray button selection with VoiceOver

[codebytere]

Description of Change

Closes #21062.

Fixes an accessibility issue where VoiceOver couldn't trigger the tray action when selected to emit the click event. This was happening because the NSStatusBarButton had no action or target, and since voiceover selection is not a mouseEvent, it wouldn't trigger mouseDown or mouseUp.

To correct this, we set a target and action for the button. We also need to create a synthetic event if we're triggering the click event via VoiceOver.

Tested with https://gist.github.com/oysteinmoseng/bec736b1c2ceec3fa6e5a77d46d3ac08 (and, of course, VoiceOver)

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixes an accessibility issue where VoiceOver couldn't trigger the tray action when selected to emit the click event.

[release-clerk]

Release Notes Persisted

Fixes an accessibility issue where VoiceOver couldn't trigger the tray action when selected to emit the click event.

[trop]

I was unable to backport this PR to "24-x-y" cleanly;
you will need to perform this backport manually.

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I was unable to backport this PR to "25-x-y" cleanly;
you will need to perform this backport manually.

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I was unable to backport this PR to "26-x-y" cleanly;
you will need to perform this backport manually.

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@codebytere has manually backported this PR to "26-x-y", please check out #39439