feat: allow showing a window without foregrounding it on macOS

[liamcmitchell]

Description of Change

Continuing #49402

Closes #49393
Adds a bringToFront option to showInactive() for macOS. When set to false, the window is shown at the back of the window stack using orderBack: instead of orderFrontRegardless.

This is useful for apps that auto-update in the background and need to recreate windows without interrupting the user.

On top of the work done by @danteissaias:

• fixes clang-tidy warning by removing default args, inlining default instead
• moves tests next to existing showInactive tests
• refactors tests

Checklist

• I have built and tested this change
• I have filled out the PR description
• I have reviewed and verified the changes
• npm test passes (for the tests related to what I have changed...)
• tests are changed or added
• relevant API documentation, tutorials, and examples are updated and follow the documentation style guide
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Added a bringToFront option to showInactive() for macOS. When set to false, the window is shown at the back of the window stack.

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[itsananderson]

I wonder if sending the window to the back of the stack is always what developers would want? Perhaps leaving the window wherever it was on the stack previously would also be a preference? I'm not sure what the behavior is if you don't call orderBack, but this makes me wonder if this property should be an enum rather than a bool, to allow for other behaviors.

[liamcmitchell]

I can't see a convenient API to get or set the exact position in the stack. The only other related API I see in their docs is order relative to another window: https://developer.apple.com/documentation/appkit/nswindow/order(_:relativeto:)