fix: disable kWindowCaptureMacV2 for desktop capturer

[VerteDinde]

Description of Change

Fixes #29458

When trying to screen capture an Electron application's own window, the screen will show as blank. This is because when kWindowCaptureMacV2 is enabled, the latter portion of the DesktopMediaID is incorrectly replaced. For example: the DesktopMediaID is changed from window:626:0 (correct) to window:626:626 (incorrect). Passing the incorrect id into the desktop capture API results in the window not being found, and a blank or default-colored screen.

kWindowCaptureMacV2 is already disabled by default in upstream Chromium (see here: https://chromium-review.googlesource.com/c/chromium/src/+/3069272). This PR also disables the feature by default until the upstream fix is in main. It also adds a new desktop capture test to keep the issue from happening again.

Checklist

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

Release Notes

Notes: Fixed an issue on Mac where an application could not capture its own window using the desktop capture or getMediaSourceId APIs.

[release-clerk]

Release Notes Persisted

Fixed an issue on Mac where an application could not capture its own window using the desktop capture or getMediaSourceId APIs.

[trop]

I have automatically backported this PR to "13-x-y", please check out #30523

[trop]

I have automatically backported this PR to "14-x-y", please check out #30524

[trop]

I have automatically backported this PR to "15-x-y", please check out #30525

[bingery]

is there any settings on linux, my linux electron app screenshot black screen, mac is ok